The Innovation Stack: Building Unbeatable Businesses One Crazy Idea at a Time

The Innovation Stack is a business methodology that shows how breakthrough companies build unbeatable competitive advantages through solving “perfect problems” that exclude vast customer segments. This book dismantles conventional wisdom about innovation and competition by demonstrating that true success doesn’t come from disrupting existing markets or copying competitors.

The Innovation Stack approach focuses on identifying problems that nobody else has solved because existing solutions and market structures actively ignore potential customers. Companies that follow this method create a series of interlocking, counter-intuitive inventions that form an unbeatable business foundation by serving those ignored by the status quo.

The Innovation Stack reveals how historical giants like Bank of America and IKEA, alongside modern disruptors like Southwest Airlines, built their empires not through strategic planning but through relentless problem-solving on uncharted territory. The book illustrates that breakthrough innovation emerges from fierce commitment to solving problems others won’t tackle, creating competitive moats through necessity-driven invention rather than market disruption strategies.

This methodology redefines entrepreneurship by showing how companies can build sustainable advantages through frontier problem-solving, offering a practical framework for creating businesses that competitors cannot easily replicate or defeat.

Part 1: Solving a Perfect Problem

Entrepreneurs and Perfect Problems

McKelvey begins by challenging the modern definition of entrepreneur. He laments that the term has lost its “shock value,” now applied broadly to any businessperson, from a dry cleaner to a freelance designer. He argues that this dilutes its original meaning, which, as popularized by economist Joseph Schumpeter, referred to revolutionaries and “wild spirits”—risk-takers who reshaped industries through genuine innovation. McKelvey differentiates these true entrepreneurs from ordinary businesspeople, comparing the distinction to that between a tornado and a strong wind: both are forms of wind, but one is rare, unpredictable, and transformative, while the other is common. For McKelvey, an entrepreneur is someone who does something truly new, often seeming “crazy” to those operating within established norms.

The core concept for true entrepreneurship lies in identifying a “perfect problem.” McKelvey introduces the Serenity Prayer as a lens through which to view problems: “God, grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference.” A perfect problem, he explains, has a solution, but it’s a solution that doesn’t exist yet. It’s a problem you can solve if you invent a new way, even if it seems trivial to others. The challenge is that you can only know a problem was “perfect” for you after you’ve solved it and solved it first. Copying existing solutions is smart for many business problems, but it doesn’t work for perfect problems because no one has succeeded before. The “wisdom to know the difference” is gained not through checklists, but through repeated failure outside the “walled city” of known solutions. He visualizes this walled city as a physical border, like medieval Edinburgh, protecting but also confining its citizens to established ways. Those who leave are “outlaws” in the traditional sense, unprotected by existing rules, but also unbounded by them. This freedom offers speed and fosters rapid invention and iteration as a means of survival.

Bob and the Pyramids

McKelvey traces the genesis of Square back to his personal experiences and frustrations with the credit card industry in 2008. He recounts losing a glass sale because his studio couldn’t accept American Express, a common issue for small businesses due to high costs and complex systems. This particular incident, combined with his long-standing friendship with Jack Dorsey (who he first hired as a brilliant, shy high school intern) and Dorsey’s sudden departure from Twitter, ignited their search for a new company idea. They sought something beyond social networking, focusing on mobile phones.

Their exploration into credit card processing revealed a world of “staggering complexity” and “dirty money.” McKelvey illustrates this with a faxed form for closing a merchant account, highlighting the term “misrepresentation”—a euphemism for “lying”—as a checkbox option. This revealed an industry where confusion and misrepresentation were so common they were formalized. A forensic accountant friend further confirmed this by advising to “only believe half of what people tell you, and always follow the money.” McKelvey did, examining a Federal Reserve report that showed a stark “pyramid” of profit. Credit card vendors made 45 times more profit from small merchants than from billion-dollar corporations ($1.8 cents per dollar vs. 0.04 cents per dollar). This visible injustice confirmed a major problem, seemingly identifying a clear market opportunity. However, McKelvey reveals that this “pyramid” was missing a crucial element: his friend Bob. Bob, a talented glassblower with an indomitable spirit, often lived in his car due to his inability to accept credit cards for his discretionary purchases. The invisible crime was not just the unfairness to small merchants who could accept cards, but the millions of small merchants completely excluded from the market. This exclusion of “Bob” represented an even larger, unserved market.

McKelvey and Dorsey used this insight in their pitch to venture capitalists, featuring “the Pyramids” as the “major crime.” Their pitch was unorthodox: they charged VCs’ credit cards with a crude prototype, confessed “140 Reasons Square Will Fail” (from fraud to robot uprisings), and then revealed the 45:1 profit ratio. This approach, while initially terrifying, disarmed VCs and showed their thoroughness. Despite this, they didn’t reveal the “Pyramid plus Bob” graphic to investors, as venture capital is for expansion, not exploration of unknown, unproven markets. They framed their focus around the 5.2 million existing small businesses, not the excluded millions. This highlights the practical disconnect between true entrepreneurship (exploring the unknown) and what investors typically seek (expanding the known).

Squaring Up

The core intrigue for McKelvey about the Pyramids was not just the visible unfairness, but why the market stopped and didn’t expand to include even more small businesses, despite the high profitability. This “end of a market” is where entrepreneurship truly begins. It represents an unguarded economic border, a virtual fence formed by the rules and practices of the current market. Existing, powerful companies often avoid the “lowest end” of the market, claiming they “don’t compete on price” or serve “more exclusive clientele,” but in reality, they simply don’t know how to efficiently deliver products at that price point. Jack and McKelvey, embracing this “foolishness,” decided to build a more inclusive and fair system, starting Square on February 11, 2009, with “absolutely no idea what we were doing.”

Square’s initial team consisted of three people and a cat named Zoë. Within hours, McKelvey realized their approach was “illegal,” having identified seventeen rules and regulations they would violate with each transaction. This was their “entrepreneurial moment,” realizing they were outside the walled city. They faced dozens of challenges, five of which required entirely new solutions that would ultimately form their Innovation Stack.

• Software Complexity: They had to connect to antiquated, unstable credit card networks. They chose a system that could print the merchant’s name on statements (avoiding chargebacks), even though it was more expensive and less secure. This prioritized user experience over immediate cost or risk, illustrating their willingness to take extra risk and lose money initially to get the customer experience right.
• Card Reading: McKelvey championed reading the magnetic stripe for lower rates, unlike Jack’s preference for camera-based scanning. He built a prototype that connected via the iPhone’s microphone jack, circumventing Apple’s costly and slow dock connector approval process. This was a direct defiance of Apple’s rules, a risky move that could have killed the company. McKelvey’s attempt to impress Steve Jobs with an aluminum prototype inadvertently revealed a flaw: it became a “cardiac reader,” sensitive to the user’s pulse, a problem he quickly fixed by building each reader by hand. This taught him to control every aspect of the product.
• Attention: Recognizing that humans ignore most sensory input, McKelvey focused on making the card reader “cute” and tiny, inspired by Japanese phone charms. Despite engineering challenges that made the tiny reader wobble and only work 80 percent of the time, they chose the “cute” design because it was “breathtaking” and sparked conversations about Square. They intentionally sacrificed some function for attention, getting people to notice something new outside the city walls.
• Moving Money: As a small startup, Square needed to find a banking partner to access financial networks, eventually securing one after several attempts. More challenging were the card networks (Visa, Mastercard, Amex), which had specific rules prohibiting Square’s business model. After securing Amex (by promising to bring them new small merchants who wouldn’t say “We don’t accept American Express”), they struggled to meet with Visa and Mastercard. McKelvey recounts a tense meeting with Mastercard’s Ed McLaughlin, where charging a dollar live violated their operating regulations. McLaughlin’s response, “So, I guess we have to change our operating regulations,” marked a critical breakthrough. Visa followed suit once its competitors were on board.
• Fraud: This was the “horrible monster” everyone warned them about. McKelvey notes that while some sophisticated attacks occurred, the vast majority came from “small, clumsy criminals.” Square’s massive transaction volume provided a data advantage, allowing them to see patterns and create unique ways to fight fraud, turning a “mighty dragon” into “ten thousand rats.”

The chapter concludes with the story of naming the company. After a failed attempt to call it “Squirrel” (due to an existing point-of-sale system at Apple), Jack Dorsey, by consulting a dictionary, landed on “Square.” The word resonated not just as a noun but as a verb: to “square up,” meaning to settle a debt or make something fair, perfectly encapsulated their mission to include excluded merchants.

The Innovation Stack

McKelvey emphasizes that their decision to “square up” the credit card world for excluded merchants forced them to leave the established market behind. They couldn’t simply copy existing solutions because those solutions wouldn’t work for their target customers or they lacked the resources/licenses. This situation, of being an “outlaw” (someone who has lost the protection of the law), granted them freedom and speed. Instead of copying, they were forced to invent. This fostered an environment of rapid innovation where creativity dominated conservatism. The process was one of invention and iteration: “Try something new, see the result, try something new again.” This problem-solution-problem chain continues until either failure or the successful creation of an Innovation Stack—a collection of interlocking and independent innovations.

McKelvey clarifies that an Innovation Stack is not a planned outcome but a series of reactions to existential threats. He notes that Square never successfully patented its famous card reader, making it available to everyone, yet they still had unique inventions. They copied everything they could (corporate structure, legal documents, HR policies), reserving invention as a last resort. Their Innovation Stack resulted from their core decision to serve people like Bob, who were excluded from the existing market, forcing them down a path of innovation.

Here are the fourteen interrelated elements of Square’s Innovation Stack:

• Simplicity: Driven by a shared bias for clean design and the complexity of the existing industry, Square adopted a single, known price (a percentage of the transaction) with no hidden fees. This was revolutionary, building trust and transparency. It also forced Square to lose money on small transactions initially, necessitating massive volume.
• Free Sign-Up: To enable rapid, frictionless growth and acquire the necessary volume, Square made signing up free, eliminating a common industry barrier.
• Cheap Hardware: The original Square reader cost 97¢ to build, compared to $950 for competitors. This allowed Square to give them away for free, even in retail stores where customers received a processing credit equal to the retail price.
• No Contracts: Unlike competitors with three-year lock-in contracts, Square allowed customers to leave any time, building trust and simplifying the sign-up process.
• No Live Support: To keep operating costs low, Square initially offered only email support. This forced them to develop even more innovation to make the customer experience so simple that live support was rarely needed.
• Beautiful Software: An elegant and easy-to-use interface reduced support needs, boosted user confidence, and critically, turned users into a sales force through word-of-mouth.
• Beautiful Hardware: The 97¢ reader was designed to be noticed, even sacrificing some functionality for aesthetic appeal. Packaged in a $2 box, it had the “jewelry” effect, becoming a design coup displayed in museums.
• Fast Settlement: Square built the fastest settlement in credit card history, often same-day, eliminating “Where’s my money?” support calls and delighting customers.
• Net Settlement: Simple pricing allowed Square to calculate the exact amount to send daily, eliminating the industry’s complex monthly debits and further reducing support needs.
• Low Price: At 2.75% (versus over 4% for small businesses), Square’s price spread by word-of-mouth, saving advertising costs.
• No Advertising: Square grew 10% weekly for two years without advertising, relying solely on customer referrals and product evangelism.
• Online Sign-Up: The entire sign-up process was paperless and instantaneous, with no credit check, to accommodate millions of potential customers. This was so foreign to the industry that competitors later copied their user agreement verbatim.
• New Fraud Modeling: To serve customers with thin credit histories, Square developed innovative fraud detection systems using data science and game theory, which were superior to traditional credit bureau methods.
• Balance Sheet Accountability: Square took the financial risk onto its own balance sheet, enabling it to massively simplify sign-up for millions of small merchants that banks wouldn’t otherwise trust. This effectively built a “new base” for the credit card pyramid.

McKelvey concludes by stressing that these elements are interrelated and co-dependent, like the Wright brothers’ airplane which was a “whole swath of innovation” (lightweight engine, steering, landing). The process isn’t planned, but an evolutionary survival instinct. “Necessity mothers invention”: you don’t plan to innovate, you have to innovate because you’ve put yourself in a situation where it’s the only alternative. This leads to a recursive “so we have to” cycle, where each solution creates new problems demanding further innovation.

Squaring Off

McKelvey introduces “squaring off”—to begin a fight—as an inevitable aspect of building a new enterprise outside the “walled city.” Entrepreneurs face two primary fears: starvation (the idea doesn’t work, can’t build the Stack in time) and predation (other firms, especially larger ones, copy your success). He recalls the early days of Square, symbolized by a pact with Jack Dorsey: celebrating with hot dogs if they failed, champagne if they succeeded. A year later, it was champagne, as Square was growing at 10% weekly.

Then, Amazon arrived, the “perfect predator.” McKelvey describes Amazon as an alpha predator in economic ecosystems, capable of quickly entering markets, using its vast resources (money, talent, brand, customer relationships, flying robots), and crushing competitors like Diapers.com. In mid-2014, Amazon launched “Register,” copying Square’s hardware (a black rectangle vs. Square’s white square), undercutting Square’s price by 30%, and offering live customer support. Square was vulnerable in all three areas.

McKelvey details Square’s “do nothing” response to Amazon’s attack:

• Card Reader: Amazon’s wider reader worked “better” by eliminating the wobble issue, which McKelvey’s tiny, square design had. However, Square chose not to change its reader design, prioritizing “beautiful design” (its coolness and ability to gain attention) over pure functionality, even though Amazon’s worked better. The iconic square reader required users to practice swiping, making them pay more attention and talk about it.
• Customer Service: Square had no live phone support, a deliberate choice to keep costs down and force simplicity in their ecosystem. While they planned to add it, they couldn’t accelerate the process just because Amazon offered it. McKelvey points to Gmail as an example of millions of happy customers without live phone support.
• Price: Amazon offered 1.95% vs. Square’s 2.75%. Square chose not to match Amazon’s price, knowing it would lead to bankruptcy. Their 2.75% was already set as low as possible while aiming for profitability.

McKelvey describes the somber mood in Square’s boardroom. They reached a “remarkable conclusion”: in response to Amazon, they would do “precisely nothing.” This was not inaction, but a commitment to their established Innovation Stack, where every element was interrelated and changing one would affect the others. The tech giants have immense advantages (money, talent, lawyers, flying robots), but Square’s energy level didn’t change because their focus was on their customers and solving their problems, not on Amazon.

The battle lasted just over a year. McKelvey never saw an Amazon Register in the real world. In October 2015, Amazon discontinued Register, even sending existing customers a little white Square reader. McKelvey realized that their survival was not just luck; it was the power of their Innovation Stack, which they didn’t even fully comprehend at the time. He began seeking other historical examples of upstart businesses that prevailed against established giants, looking for a pattern, a “deeper lesson” beyond simple luck.

Copies of Copies

McKelvey reflects on Square’s victory against Amazon, expressing persistent unease because he couldn’t explain why they won. He realized that since start-ups don’t usually beat Amazon, Square must have done something original or exceedingly rare. To understand this, he applied an “indirect proof” or “negative space” approach, focusing not on originality, but on its opposite: copying.

He then presents the universal formula for success in any existing industry: “Copy what everyone else does.” He illustrates this with the restaurant industry in New York City, citing Randy Garutti, CEO of Shake Shack. Garutti admits they didn’t invent the hamburger; their menu was inspired by existing local favorites like Steak ‘n Shake and Ted Drewes. While Shake Shack obsesses over perfecting details and “doing everything just a bit better,” they use the same suppliers, steal talent from competitors, and price similarly. McKelvey notes that entire industries exist solely to help businesses copy, making success a matter of phenomenal hard work and execution on the basics. Building a business in a preexisting market is like stepping into a crowded elevator: you find room, make small improvements, and carve out a niche.

McKelvey argues that understanding what entrepreneurship is not helps define what it is. The force opposing entrepreneurship, replication or copying, is fundamental to life itself. From DNA to human learning, we are “born from copying and born to copy” because “it works!” Schools, for instance, formalize copying, often allowing students to achieve master’s degrees without a single original thought. He recounts his friend Howard Lerner’s failed attempt to teach entrepreneurship; students would just copy his examples, starting coffee companies instead of innovating.

McKelvey then connects this to the concept of “company” meaning both a group and a business: companies copying companies have company. While society values originality, our behaviors are often in lockstep. Copying is almost always the best option because things that work are rare. However, the problem with copying is that “nothing ever changes.” Nature introduces change through sexual reproduction, even though asexual reproduction is mathematically more efficient, because “perfect copies lose out over time” without adaptation. Similarly, in business, while change is usually slow, “invasive companies” that create new markets can achieve explosive growth.

He concludes by stating that copying and innovation are partners. When solving a “perfect problem” and creating explosive growth, most of what you do will still be copying, but you must “invent when you must.” Copying, while comfortable and often the right answer for existing markets, will never produce transformative change or a situation with no competitors. This inherent risk explains why becoming an entrepreneur “seems crazy,” but some choose it anyway, driven by a deeper motivation.

Part 2: The Mythical Expert

McKelvey explains that people choose to leave the “walled city” of known solutions due to two types of motivation. The first is perseverance—the widely respected ability to “get going and keep going.” The second, unique to entrepreneurs and artists, is audacity—the reason one dares to attempt something that has never been done. Once you have the audacity to step outside, perseverance becomes a matter of survival; “if you quit, you die.” The real choice is whether to tackle a perfect problem, driven by the audacity to overcome the fear of failure. McKelvey intends to share stories of entrepreneurs to allow readers to gain their own insights into this audacity.

Lemonade

McKelvey shares a deeply personal story as his first example of audacity: a childhood experience with a cash-only lemonade stand (selling orange Tang) in 1972. As a skinny, seven-year-old without an older sibling, he was cheated, his drink diluted, and he felt powerless and angry. This memory of being unable to express his anger became a foundational experience.

He describes anger as a “crazy energy source,” like gasoline, which can fuel destruction or progress depending on its use. This early feeling of powerlessness, combined with his father’s controlled temperament, taught him to channel his anger. This energy fueled his decision at eighteen to write a new computer programming textbook while a freshman at Washington University. His motivation was spite: the existing textbook was poorly written, full of errors, and expensive, enriching the computer science department chairman at students’ expense. Despite lacking qualifications (no prior programming, not an engineering student, no writing experience), he wrote the book.

The textbook, produced with help from friends and teachers, was exactly what a freshman student would want. It caught the attention of major publishers, and his second book became a bestseller. This experience taught him “how commitment can substitute for qualification.” He reflects that people called his initial endeavor “crazy” but he became desensitized to the label. McKelvey has undertaken a dozen “crazy” projects, from software companies to non-profits, all stemming from a problem he deeply cares about. He concludes that caring about something is an audacious source of energy, even if the original spark was anger, as a part of that seven-year-old boy still comes to work with him every day.

Entrepreneurs Everywhere

After Square’s Amazon victory, McKelvey sought other “survivors” to understand how they won, but found none willing to speak on record. He desired a mentor—someone who had walked his path before. Realizing that living entrepreneurs are too busy, he decided to look back in time, overcoming his “prejudice against being dead.” He recognized that history itself is a chronicle of significant events, including the massive impacts and longevity of Innovation Stacks. Looking back, he found countless examples, making his own experience at Square seem “almost commonplace.”

To avoid data skew from Moore’s Law and viral growth in tech, he sought mentors from “boring” industries where the impact of an Innovation Stack would be stark. He set three criteria for his case studies:

• A U.S. financial company: Founded by outsiders, for excluded people, with a similar journey but no computers. He found A. P. Giannini and the Bank of Italy in San Francisco.
• A common, low-tech industry: Thousands of years old, touching nearly everyone globally, with a perfectly level playing field.
• The “worst industry imaginable”: Ruthlessly competitive, destroying fortunes, with no technological edge, and highly regulated.

McKelvey notes the challenge of identifying Innovation Stacks in history, as they often become entire industries themselves, making the originator hard to find. He states that Giannini’s Innovation Stack was so successful it eventually became the entire banking industry model, casting a “large shadow” over the financial world, which Square had unknowingly stood in. He concludes by introducing A. P. Giannini as his first historical mentor.

The Bank of Italy

McKelvey tells the story of Amadeo Pietro (A.P.) Giannini as a “superhero” tale to illustrate the power and timelessness of the Innovation Stack in the banking industry. Born in 1870, Giannini’s early life was marked by tragedy when his father was shot dead over a $1 dispute, instilling in young A.P. an understanding of money problems. He later joined his stepfather’s produce trading firm, developing a legendary work ethic, famously swimming a river to beat a competitor to a farm. By 31, he retired wealthy and joined a bank board.

However, banking in 1901 ignored small businesses, forcing people to loan sharks. A.P. tried to persuade his fellow directors to change, but failed. In frustration, he quit and, despite knowing nothing about banking, decided to open the Bank of Italy for “people who don’t use banks.” McKelvey draws a direct parallel to Square’s founding, where outsiders (a glassblower and massage therapist) similarly entered an unknown industry to include the excluded. Their decision to serve “the little fellow” forced them to build an Innovation Stack.

The ultimate test came with the Great San Francisco Earthquake of 1906. While other banks met and decided to stay closed for six months, A.P. raced into the burning, lawless city, retrieving his bank’s gold and records by disguising them under vegetables in produce carts. Two days after the quake, A.P. and the Bank of Italy were on the wharf, lending money to anyone who wanted to rebuild San Francisco. This audacious act cemented his unique approach.

The Bank of Italy’s Innovation Stack (which later became Bank of America) bore striking resemblances to Square’s:

• Focus on “the Little Fellow”: Giannini explicitly aimed to serve wage earners and small business people, regardless of the size of their deposits, considering them “the most valuable client.” This necessitated catering to Banking for Women, opening the country’s first bank for women after the 19th Amendment.
• Low Rates: Charging 7% interest while competitors charged 12%, this attracted a frugal and responsible clientele and drove massive loan volume, requiring new ways to attract depositors.
• Direct Sales Force: Unlike other banks, Bank of Italy sent salesmen door-to-door and to social events, doubling account numbers in takeovers. This required Advertising to small savers (e.g., “ONE DOLLAR—It is not much—but it is worth saving”).
• Low Minimums: Making it easy to open an account with as little as $1.
• Simplified Underwriting: Paperwork was far simpler, with handshake loans common after the earthquake, and branch managers empowered to consider character over raw numbers.
• Multilingual Tellers: To serve immigrant customers who spoke little English.
• Open Floorplans: Unlike intimidating, barred banks, Bank of Italy branches were open and friendly, with A.P. himself often sitting at the front.
• Expanded Hours: Matching people’s lives, with evening and even Sunday hours.
• Home Mortgages: Making loans on people’s homes before it was common, benefiting builders and furniture makers, and later expanding to Auto Loans and Installment Credit. This required loan decisions based on borrower character, not just assets.
• Rapid Expansion: All these innovations drove the need for rapid growth, often through acquiring existing banks. This led to Branch Banking, which balanced financial forces across diverse regions and gave small towns access to corporate financial power.
• Distributed Ownership: To finance massive growth and protect against hostile takeovers, Bank of Italy pioneered selling tiny amounts of stock to large numbers of employees and customers, ensuring no single entity owned more than a few percentage points, including Giannini himself.

McKelvey concludes that the fact that almost every bank today has copied the Bank of Italy’s model is a testament to the power of entrepreneurship and inclusion. Giannini, by serving “the little fellow,” built the largest bank in the world because there are far more “little fellows” than “big shots.” His journey was remarkably similar to Square’s, beginning with ignorance of the industry, seeing injustice, and being forced to rebel and rebuild. This historical pattern confirmed that McKelvey’s inability to find living mentors was due to the rarity of such innovators in any given time.

The Boy They Kicked Out

McKelvey acknowledges that Giannini’s superhero-like persona might lead one to attribute success to individual ingenuity rather than the Innovation Stack. To truly prove the Stack’s power, he sought a case study with “the least drama,” no computers or network effects, in a mundane industry (furniture) with thousands of competitors and high regulation. The entrepreneur, too, had to be the opposite of a caped hero: introverted, shy, and perhaps even driven out of the walled city. He found this in Ingvar Kamprad, the founder of IKEA. McKelvey chose to include Kamprad’s story despite his regrettable early association with a pro-Nazi party, to demonstrate the Innovation Stack’s power independently of the entrepreneur’s benevolence.

In 1943, at seventeen, Kamprad founded IKEA (Ingvar Kamprad, Elmtaryd, Agunnaryd), initially selling matchboxes and other small items via mail order. For the first few years, he copied his competition, particularly Gunnars Fabriker, which also sold furniture. This led to an inevitable price war, driving down both quality and profits for items like the Melby ironing board. Kamprad realized this race to the bottom was unsustainable for IKEA’s reputation.

Kamprad’s competitors unwittingly forced his hand, turning him into an entrepreneur. Starting in 1950, IKEA was banned from furniture trade fairs, and Kamprad himself was forbidden from attending. In response, he rented space near a fair in Stockholm, drawing huge crowds curious about the “forbidden furniture.” This success spurred him to buy an old building, clear it out, and create a permanent furniture display. This was IKEA’s first catalog dedicated to furniture, inviting customers to “touch the goods” and compare quality, solving the ironing board problem by demonstrating that customers would “wisely choose the more expensive ironing board.”

The competitive attacks escalated: other Swedish furniture sellers organized a boycott of IKEA’s suppliers, forcing Kamprad to seek manufacturers elsewhere. He turned to Poland, a country with low labor costs and good resources, despite its antiquated factories. Kamprad later recalled, “New problems created a dizzying chance.” This forced innovation led to IKEA’s unique style and supply chain.

IKEA’s Innovation Stack, driven by bans and boycotts, transformed the furniture industry:

• Catalog Showrooms: The core concept of using a catalog to draw people to a large exhibition space where they could physically interact with and compare furniture.
• Overseas Manufacturing: Forced by the boycott to go to Poland, leveraging lower labor costs.
• Efficient Factories: Redesigning Polish factories to improve quality and lower costs.
• Knocked-Down Furniture: To save shipping space and reduce damage from bulky furniture, leading to Self-Assembled Furniture by customers.
• Custom Design: IKEA built its own design staff to simplify assembly and optimize furniture for efficient production in their customized factories, leading to Interchangeable Parts across products.
• Global Supply Chain: Growth allowed IKEA to source items from the best spots globally, leading to Warehouse Showrooms where knocked-down furniture could be stored adjacent to showrooms, saving shipping costs and allowing immediate customer pickup.
• Winding Paths: Cleverly designed store layouts along winding paths to guide customers through the full range of products.
• Food and Child Care: To encourage customers to spend more time in the massive stores (e.g., ball pits).
• Low Prices: Sharing all the efficiency gains with customers, reflecting a philosophy of “democratic design”—good design adapted to machine production and thus cheap.

Kamprad’s vision was to make “a wide range of home furnishing items of good design and function at prices so low that the majority of people can afford to buy them.” McKelvey notes that both Square and IKEA initially tried to copy existing models but were forced to innovate by external pressures. IKEA, despite the drama of its founding, illustrates how an Innovation Stack can transform even the most “undramatic” industry.

The Cloud God

McKelvey recounts his journey to meet Herb Kelleher, the legendary former CEO of Southwest Airlines, whom he considers the “perfect test case” for his theories on Innovation Stacks. Southwest operated in the “worst industry in the world”—commercial aviation, which had consistently lost money and was riddled with financial failures even from the Wright brothers’ time. Yet, under Kelleher’s 30-year leadership, Southwest achieved unparalleled success: lowest fares, happiest customers, best on-time record, fastest growth, and highest profits. McKelvey’s initial goal was to understand why Southwest chose not to copy other airlines.

Kelleher explained that the airline industry was set up by federal government regulation in 1938 to protect itself from competition. This regulation effectively locked in market share, preventing new entrants and innovation. Kelleher, originally Southwest’s lawyer, spent four years fighting the government and other airlines (taking the battle to both Texas and US Supreme Courts) before Southwest could even make its first flight. This legal battle confirmed that Southwest was “born outside the wall,” legally prevented from copying others. Kelleher emphasized, “We were not going to copy… fundamentally we decided we won’t do anything the way the legacy carriers did.”

Kelleher revealed how this constant attack from competitors (e.g., excluding Southwest from credit card systems, blocking refueling, boycotting vendors, limiting routes, even leading to an indictment for conspiracy) ultimately strengthened the company, fostering a “warrior spirit” and an environment where innovation thrived. This resulted in a 50-year-enduring Innovation Stack:

• Maximized Aircraft Utilization: Southwest’s core insight: “Planes make money in the air, not on the ground.” This drove them to fly more often.
• Ten-Minute Turnaround: After losing an airplane early on, financial pressure forced them to achieve what other airlines considered impossible: turning planes around (disembarking, unloading, cleaning, fueling, boarding) in ten minutes or less, enabling more flights with fewer planes and contributing to their industry-best on-time performance.
• Standardized Fleet: To simplify and speed up turnarounds, Southwest flew only one type of airplane: the Boeing 737. This simplified maintenance, ground operations, and allowed pilots/crew to substitute for each other, even influencing Boeing to build special 737 versions for them.
• Batch Boarding & Open Seating: Passengers received reusable plastic boarding passes and boarded first-come, first-served in batches, choosing their seats as they boarded. This was fast, simplified reservations, and was preferred by profitable last-minute business travelers.
• Single Class: Treating everyone equally reduced boarding time and allowed more seats per plane, simplifying operations.
• Fringe Airports: Choosing less congested airports (e.g., Islip for NYC, Baltimore for DC) to avoid tarmac delays, ensure punctuality, and lower landing fees.
• Direct Routes: Rejecting the hub-and-spoke model, Southwest flew direct, keeping planes in the air and ground crews busy, proving more cost-effective than connecting flights.
• No Food: Recognizing that passengers prioritized affordable prices and punctuality over mediocre airline meals, Southwest offered only peanuts and drinks, with continental breakfasts at gates for early flights.
• Friendly Staff: Southwest hired for personality first, even if it meant training for job function. Friendliness was a corporate value, with management often prioritizing employee needs over customer or shareholder demands (“employees come first”). This created a fun culture where employees made heartfelt gifts for Kelleher.
• No Stupid Rules: Kelleher famously burned the thousand-page rule book, replacing it with 22 pages of guidelines that encouraged leaders to “break them” when necessary, empowering employees.
• Independent Sales: Southwest refused to join global ticketing systems, requiring customers to buy tickets directly from Southwest. This saved money, reduced fees, and trained customers to seek Southwest first.
• Low Prices: The most important strategy, making air travel available to those who “didn’t want to fly.” A 1993 study by the US Department of Transportation confirmed Southwest’s low fares were driving industry-wide price drops.

McKelvey highlights that Southwest’s constant battles and federal deregulation in 1978 (which Southwest’s success helped bring about) strengthened the airline. The interview concludes with Kelleher’s emphasis on the “fun” involved in doing something new. He described how Southwest’s culture celebrated its people as heroes, creating a stark contrast to other airlines and showing that when focus is on customers, not competitors, it’s more enjoyable.

When

McKelvey dedicates this chapter to the crucial, yet often overlooked, element of timing in entrepreneurial success. He admits his own lack of mastery in this area, having learned a profound lesson from his glassblowing mentor, Lino Tagliapietra, the “best glassblower in the world.” McKelvey describes his fifteen-year struggle to consistently attach a “foot” to a glass bowl, a basic technique that often failed for him. When he finally got to ask Maestro Lino his single allowed question, he expected a “how-to” demonstration. Instead, Lino taught him about “when.”

Lino had him make the bowl and the glass “foot.” Then, just as McKelvey was about to join the hot foot to the colder bowl, Lino said, “Wait.” After a moment, he said, “Now.” The foot went on perfectly. McKelvey realized his problem wasn’t technique (how), but timing (when). If the glass is too hot, it collapses; if too cold, it’s too stiff. This revelation made him reflect on “all the other places in my life where I had done the right thing at the wrong time.” Schools, he notes, teach “how,” but rarely “when,” because “when” is far harder to study, requiring repeatable tasks in varied temporal conditions. Econometrics, his brief foray into predicting the future, proved that even the “smartest minds” couldn’t determine when to use specific predictive techniques.

Simplifying time, McKelvey asks, “When should we begin?” with two answers: now or later. “Now” is often right for speed, to profit before competitors copy, or to be first in a race where passing is difficult. However, being first is not always best. He cites the example of social networks: GeoCities, Friendster, and MySpace all launched before mobile computing was commonplace, while Facebook’s timing was “fantastic” because it launched when mobile exploded. You can be “too early” if a critical element of the Innovation Stack is missing.

Sometimes, a key element is outside your control. He uses ride sharing as an example, which existed in Soviet Leningrad in 1986 due to a lack of violent crime and government knowledge of citizens’ identities. This system couldn’t be brought to the US for decades until mobile phones provided the missing “safety problem” solutions (identity systems, maps, stranger ratings, cashless payments). For Square, the missing element for its first year was permission from the credit card networks; their rules prohibited Square’s model. The moment Mastercard agreed to change its rules was critical.

McKelvey emphasizes that if you are purposely waiting for a missing element, you must work on all the other elements of your Innovation Stack in the meantime. This is risky, as there’s no guarantee the missing piece will appear (e.g., Mastercard and Visa changing rules). But when it does, the rest of the Stack is ready. He notes that “right feels early”—if the timing feels “right” (i.e., comfortable, like the herd), you’re probably too late. If it feels “too early” or slightly uncomfortable, it’s a good time to leave the walled city.

He introduces the concept of the Horizon of Possibility, where “somebody else’s new invention may be the missing piece to your Innovation Stack.” Entrepreneurs must bet on these future changes, like Square betting on mobile technology. He also suggests that Innovation Stack-driven change can itself supply the missing element. Square’s fully functional (if illegal) system influenced Mastercard and Visa to rewrite their rules to accommodate them. Similarly, Southwest Airlines’ demonstrably better service and low prices within Texas (a “Texas-only” airline) were the main example Senator Kennedy cited to support airline deregulation, allowing Southwest to become the nation’s largest airline. This highlights how “leaping can cause you to grow wings.”

Finally, being ready is crucial when external market changes occur. Southwest, having fought battles for seven years, was ready when deregulation hit in 1978. Bank of America, with its developed Stack in California, was ready for branch and interstate banking deregulation. Square’s Stack was ready when Steve Jobs unveiled the first iPad, making Square the only financial application on it. This pattern of a working Innovation Stack meeting an external market change leads to explosive growth. When an Innovation Stack is complete and expanding the market, it’s time to grow fast! McKelvey warns that “long lines are dangerous,” as neglecting new market segments can invite copycats (like iZettle in Sweden) or competitors (like JetBlue, which capitalized on Southwest’s neglect of the NYC market).

Part 3: Innovation Physics

McKelvey reiterates the pattern observed across the four companies: entrepreneurs solve a perfect problem, are forced to invent due to lack of existing solutions, and build an Innovation Stack that expands the market to include previously excluded people. He notes that these Stacks often evolve out of sight within tiny firms before becoming giants, and when viewed in hindsight, they may seem obvious, but were radical at the time.

He acknowledges the cost of learning from the past: history trades drama for data, making the entrepreneurial battle seem like a game. The journey into the unknown is made “blind,” “poor,” “alone,” and “hunted.”

• Blind: Lack of reliable forecasting means “experts” from existing markets are comically incorrect, and you cannot study something that doesn’t exist.
• Poor: Investors are risk-averse, focusing on return of capital, not just return on capital. Square courted investors only after having a working product and happy customers.
• Alone: Explaining something truly new is incredibly difficult, leading to a lack of partners and small teams of believers.
• Hunted: Existing businesses will see you as a threat and attack through various means (press, courts, legislation).

However, McKelvey asserts, something powerful protects the entrepreneur: a “different set of rules.” This new entrepreneurial world inverts normal business rules, acting like quantum mechanics versus classical physics. While classical physics explains daily life, understanding quantum mechanics (rarely necessary) enables building powerful computers. Similarly, most of life can be lived through copying, but understanding entrepreneurship, though rare, enables solving problems for millions. McKelvey states that while quantum mechanics is weird, its powers can be harnessed, just as the world of entrepreneurship, though poorly understood, offers unique powers.

Stack Attack

McKelvey likens the entrepreneur’s journey to the American frontier, where market expansion was not peaceful. Entrepreneurial companies are attacked with “ferocity that could end with a trial at The Hague.” He re-emphasizes that Southwest, IKEA, Bank of Italy, and Square all faced vicious assaults (legal battles, boycotts, negative PR, price wars) while still small, yet survived and became industry leaders. This wasn’t luck.

The core reason for their survival is the Innovation Stack itself. It’s not just a list of independent changes, but an integrated system where “each block… only works in conjunction with all the others, and the entire Stack fails if one block is missing.” McKelvey uses Square’s online sign-up as an example: it only works with new fraud modeling, which requires high volume, necessitating other Stack elements. Copying just one or a few elements isn’t enough; Amazon would have had to copy all fourteen of Square’s elements successfully.

He illustrates the “math of an attack”: if Amazon had an 80% chance of copying any one of Square’s 14 elements successfully, their chance of copying all fourteen was about 4% (0.8^14). This is an oversimplification, as Innovation Stack elements are interdependent. He compares it to a jump rope with variables like mass and elasticity: dynamic systems are hard to understand and “nearly impossible to copy” because “everything affects everything.” While humans are poor at modeling complex dynamic systems mathematically, entrepreneurs, fighting for survival, “just do it and observe,” making adjustments iteratively.

This constant adaptation, especially in small companies, leads to “Innovation Interlock,” where each element of the Stack adapts to its neighbors. For instance, Southwest’s pilots cleaning cabins (a non-pilot task) works because the entire culture supports fast turnarounds. He uses the examples of United’s failed copycat airline, Ted, and Delta’s Song. Despite studying Southwest for 30 years and being a major carrier, Ted failed because it “couldn’t replicate even half of Southwest’s innovation.” Ted kept two classes of service, assigned seats, and used United pilots with different contracts. Kelleher famously explained, “They all took one thing out of twenty and said, ‘This is what is going to make us the next Southwest,’ but actually it was our holistic mixture.” Copycats also forget that corporate culture itself is part of the Innovation Stack, evolving alongside it and supporting the innovation.

McKelvey addresses the paradoxical “do nothing” response to Amazon’s attack. In established markets, companies copy competitors. But an entrepreneurial company, focused on its customers (especially new ones not stolen from competitors), should “do nothing different” in the face of attack. He cites Southwest’s $13 fare war with Braniff in 1973. Instead of matching Braniff’s lower price, Southwest offered customers the option to pay the full $26 fare and receive a complimentary bottle of scotch. Southwest knew its business fliers valued convenience over price and couldn’t be swayed by a temporary price cut. Southwest outsold Braniff at twice the price and became “the largest liquor distributor in Texas.” This shows that “planes don’t have rearview mirrors, and neither do great entrepreneurial companies.” They focus on their customers and their Innovation Stack.

The Invisible Army

McKelvey describes the feeling of being attacked by larger competitors as scary and lonely, but emphasizes that entrepreneurial companies are surrounded by millions of “invisible” potential customers who are outside the walled city. These customers are difficult to see initially because existing measurements are optimized for the current market (e.g., government surveying only people who had flown when Southwest’s future customers were taking buses). Herb Kelleher saw the “pretty big market opportunity” in the 15-20% of Americans who had never flown commercially. Most Square customers had never accepted credit cards, IKEA customers never bought new furniture, and Bank of Italy customers never used a bank. “Invisible does not mean uninterested.”

These new customers are a great benefit because they hold few preconceptions. McKelvey calls them “early adapters” (not just adopters), as they adapt to the entrepreneur’s way of doing business. Square taught its customers to expect simple, low rates, no live support, fast settlement, free hardware, and beautiful software. Southwest taught its customers batch boarding, open seating, no food, and no baggage fees. IKEA taught its customers to visit massive showrooms, assemble furniture, and expect great design at low prices. These companies “custom built their market” by training their customers in a new way.

Entrepreneurial firms effectively train new customers using the psychological phenomena of anchoring (relying on first information) and conservatism (insufficiently revising beliefs). By inventing something truly new, they create a “new mental real estate” in customers’ minds, anchoring them to the new idea and making them “conservative toward your competition.” Competitors face a “massive challenge”: either copy the Stack (nearly impossible) or retrain the customers (supremely difficult).

McKelvey identifies three major problems entrepreneurial firms face when conveying new ideas:

• The Curse of Knowledge: Intimate familiarity with a complex system (like a pilot in a cockpit or a friend with a complex stereo) makes it impossible to appreciate its complexity for a novice, leading entrepreneurs to fail to adequately explain their systems.
• Linguistic Gravity: When a new product is somewhat similar to existing ones, people use familiar words that pull all similar thoughts into them (e.g., “farm” for mushrooms, “airline” for low-cost travel), causing customers to mistakenly assume they understand and then stop listening. Southwest battled this by always adding “low-cost” to “airline.”
• Feedback Failure: People hide their contempt or confusion, giving incorrect positive feedback due to politeness, making it hard for entrepreneurs to know if their message is understood. McKelvey shares his LaunchCode experience where employers “loved” their program but didn’t hire graduates because “LaunchCode” (a nonprofit helping people) created the Linguistic Gravity of “not talented,” when in fact the graduates were highly skilled.

To overcome these, entrepreneurs need to gain customer attention. McKelvey notes that the slightly difficult-to-use small Square reader was a deliberate choice to leverage the “processing difficulty effect”: people remember things better if they struggle to learn them. This turned customers into a sales force. He compares it to the initial discomfort of ride-sharing (choosing front or back seat), which captured attention and led to new learned behaviors. The IKEA Effect (customers valuing self-assembled furniture more due to their labor) is another example of making customers “uncomfortable enough to learn the IKEA way.” Giannini’s multilingual tellers and open floorplans also aimed to make banking memorable and easy to learn for new customers.

McKelvey concludes that Square’s initial focus on one small problem led to gaining the attention of millions. Their unique products, in the hands of millions of customers, generate billions of interactions, making their “invisible army” a critical part of their Innovation Stack. This army buys, sells, develops, and defends their products, and Square shows its respect by focusing on their needs.

Low, Not Lowest

McKelvey delves into the nuances of pricing for entrepreneurial companies, distinguishing between a “low price” and the “lowest price.” A low price stems from a company philosophy to consistently deliver maximum value to the customer, aiming to keep prices as low as possible while maintaining quality. The lowest price, conversely, requires constant comparison with competitors, leading to a race to the bottom.

Southwest, despite its “low price” ($69 vs. $400 for competitors), maintained the best on-time record, baggage handling, and lowest customer complaints, demonstrating that a low price does not preclude high quality. Kelleher rejected the “either-or mode” of low prices or good customer service. Similarly, IKEA, after its price war with Gunnars, focused on offering a low price on a high-quality product, even reducing prices for items with no competition. The Bank of Italy set interest rates significantly lower than competitors (7% vs. 12%) while being more accommodating in other ways. Square priced its services at 2.75% (vs. >4% for small businesses) and eliminated all other fees, continuing to lower rates and add services as conditions allowed.

McKelvey argues that a low price paradoxically means not lowering it in the face of competition. Square did not match Amazon’s 1.95% rate because their 2.75% was already set at the lowest sustainable level. Lowering it would have led to bankruptcy, and raising it back after Amazon left would destroy customer trust. Entrepreneurial companies, focused on customers, not competitors, use their Innovation Stack as a weapon (e.g., Southwest’s scotch promotion during the $13 fare war). The ability to set prices differently flows from the Innovation Stack; low price is a result, not a primary goal.

McKelvey then explores why “low” price makes sense even if entrepreneurs aren’t universally altruistic, focusing on three factors:

• Customer Trust: A low, consistent price builds trust in the brand. This trust is “precious and delicate,” earning customers who are more valuable than those who merely “love” the product. Trust leads customers to buy without comparison shopping, eagerly await new products, and become the best salespeople.
• Corporate Alignment: When employees see the company isn’t exploiting every pricing advantage, it signals that the company values its customers. This fosters a shared culture and empowers employees to make good decisions, as seen in Southwest burning its rule book. A cynical employee who sees exploitation will likely become skeptical and spread negativity.
• Competitive Advantage: Keeping prices low, even without immediate competition, leaves little room for new entrants. If an Innovation Stack allows you to sell for $5 while competitors sell for $10, the gap is too large to cross by copying just a few elements. If you charge $9, a competitor might copy one or two elements and sell for $8, creating a competitive spiral. By reflecting every efficiency of the Innovation Stack in a low price, competitors are forced to attempt everything at once and are more likely to fail or quit. This creates a self-reinforcing positive loop, as loyal customers provide feedback for continued innovation, maintaining the lead for decades.

McKelvey highlights “bad examples” of companies abandoning low price: Bank of America (formerly Bank of Italy) became “second-most-hated” by charging “ridiculous fees” after Giannini. Southwest Airlines, after Herb Kelleher retired in 2008, also abandoned its low-price philosophy, with fares climbing over 30% and prices becoming higher than competitors. This led to a price-fixing lawsuit and the success of five new low-cost airlines that were able to compete where Southwest once dominated. IKEA, however, despite its founder’s death, continues its low-price philosophy and dominates the furniture market globally. McKelvey concludes that abandoning low price temporarily boosts profits but invites competition and rapidly loses customer trust. He reiterates Kelleher’s philosophy: Southwest never tried to “maximize revenues” because its low costs were its “strongest, sharpest competitive weapon,” ensuring a low price based on internal efficiency, not external competition.

Disrupting Disruption

McKelvey challenges the concept of “disruption,” particularly as it’s used in Silicon Valley. He argues that the very act of focusing on disruption can lead to unconscious copying of the system one intends to dismantle. Square, for instance, avoided hiring payments industry “experts” for years to prevent their thoughts from being constrained by existing practices. McKelvey himself stopped reading nonfiction while writing, fearing he would unconsciously copy others’ ideas.

He contends that “disruption” has become as diluted as “entrepreneurship,” oversimplified from Clayton Christensen’s original concept of disruptive innovation. It’s now “high-fructose corn syrup of business,” used to disguise conformity. He questions whether disruption is always positive, citing Craigslist’s disruption of classified advertising, which led newspapers to fire reporters and potentially leave “scandals” unexposed.

More dangerously, focusing on disruption is a “retrograde focus,” looking at old systems to be destroyed, rather than the creative potential of innovation. McKelvey’s study of great entrepreneurs found “something far more positive” than destruction: the vast majority of entrepreneurial ventures did not steal customers from established businesses, but rather brought new people into a market. He champions “optimism, innovation, and inclusion” as the true buzzwords of market expanders. “Disruption deserves to be disrupted.”

He re-examines Square: it created a new base under the credit card pyramid for millions of previously excluded businesses, causing “remarkably little, if any, disruption” to existing major credit card processing firms, many of which still exist and have grown (e.g., PayPal).

Similarly, he questions if Southwest Airlines disrupted other carriers. Kelleher stated that Southwest actually increased the total number of travelers, noting that when Southwest entered the Dallas-Houston market, it grew from 34th to 5th largest in the US, with all other carriers also seeing increased traffic. Southwest wasn’t taking business; it was “growing the market.” The bankruptcies of other airlines, McKelvey argues, were due not to Southwest’s entry but to the chaos of airline deregulation in 1978, which removed 40 years of government protection.

He also looks at IKEA’s impact in South Korea: when it opened its first store there in 2015, local furniture makers saw increases in sales, and the entire South Korean furniture market, flat for two decades, saw unprecedented growth. While some Korean furniture companies disappeared, this decline began before IKEA arrived. Finally, the Bank of Italy model, largely invented by Giannini, did transform banking by serving everyone, but the individual incumbent banks largely still exist.

McKelvey concludes that disruption by itself is not bad, but it has never been the focus of good entrepreneurs. These entrepreneurs set out to build, not destroy. Focusing on disruption means looking backward; entrepreneurs look at their (potential) customers and the horizon beyond the wall. If disruption occurs, it is merely a side effect. Entrepreneurs are market expanders who “distribute that future” to those waiting for it, rather than just disrupting existing players.

How It Feels

McKelvey aims to mentally prepare the reader for the discomfort of entrepreneurship by discussing how it feels to him, as personal emotions are often absent from historical records. He expresses a desire to have asked historical entrepreneurs like Giannini not “how they did it,” but “how it felt”—were they scared? Why didn’t they quit?

He describes the feeling of humility through A. P. Giannini, who lived and died modestly, never seeking massive fortune or putting his name on the bank that became the world’s largest. Giannini’s profound humility allowed him to connect with “the little fellow” and admit what he didn’t know, freeing his mind from the “constraints of the known world.” McKelvey links humility and audacity as allies: “To actually do something new requires us to first summon the humility to admit that our solution may not work, followed by the audacity to try anyway.”

McKelvey then addresses fear. As herd animals, humans feel safe when behaving like others; acting differently causes fear. He admits to never learning how not to be afraid, but he has learned to “work effectively even when I’m scared.” He uses his experience learning to fly small planes while terrified: the lessons “really take” when learned in fear. The key is not to freeze, but to act even while afraid. He suggests practicing with discomfort, like talking to strangers or public speaking, to “get comfortable with discomfort.” Fear, if managed, can be a “huge advantage.”

He discusses Feedback Failure in innovation: positive feedback often lags far behind true innovation, meaning entrepreneurs may have “no proof when you could really use it.” The lack of “reverberation” in an “anechoic chamber” of no immediate validation can be “crazy-making.” He notes the cruel irony that praise for successful entrepreneurs only arrives after success, “like receiving a Kevlar vest as a get-well present after you’ve been shot.” The greatest mental challenge is the uncertainty of the journey’s length or completion.

McKelvey emphasizes using “innovation” as a mass noun (like “cement”) to convey its interconnectedness: one invention necessitates a successor, impacting an entire system (e.g., plane boarding impacting pilots, tickets, airports, etc.). This thinking prepares one for the terrifying moment their path diverges from the herd. While innovation is difficult, it means competitors can’t easily copy you, and the reward of market dominance and long-term competitive advantage (through low price) is significant.

Finally, he tackles the “Mythical Expert.” He argues that expertise exists only within the “walled city” of the known. Outside, there are “no experts, just survivors and bones.” He highlights that successful innovators like Kelleher (lawyer running an airline), himself (glassblower running payments), Giannini (produce vendor running a bank), and Kamprad (17-year-old starting a furniture empire) had no formal qualifications for what they did. “Qualification comes only from successful experience, and successful experience by definition cannot exist in the case of an unsolved problem.” Waiting for qualification means only ever doing what’s already been done.

He concludes that stubbornness (perseverance in action) is the most common trait among entrepreneurs he studied, fueled by a “perfect problem”—something they care deeply about. Money and fame are weak motivators; genuine problems (like a friend sleeping in his car or being ripped off by credit card companies) provide infinite, obvious motivation. The reward is internal, “undiminished” even if no one else understands the joy of solving a problem you truly care about.

Back to Zero

McKelvey summarizes his journey, reflecting that Square’s win against Amazon was no longer a mystery. He emphasizes that entrepreneurship is rare, and we lack the language to describe truly new things because our vocabulary is built for “relentless replication.” He grapples with whether this newfound knowledge helps, recounting how Square’s IPO, bringing him money and access, didn’t make solving new problems easier. He likens it to Michael Jordan trying baseball: money and contacts help in a game you know, but when doing something new, “we are all even.” Entrepreneurship “starts at zero.”

He shares the personal tragedy of his coworker Anatoly’s son, Daniil Maksimenko, being shot and killed delivering pizza in a “sketchy part of town.” McKelvey’s initial, logical explanation (mentally ill assailants) failed statistically, forcing him to the “even worse conclusion”: that in parts of his city, “shooting a stranger in the head is somehow normal.” This deep depression led him to seek a solution to the underlying problem: a lack of opportunity for young people, compounded by a programmer shortage in St. Louis.

He founded LaunchCode.org to address both: a lack of talent for businesses and lack of opportunity for people. He discovered that the existing system of coding education and job placement was “broken” because it had simply copied what worked for other industries. Unlike welding, bad coders can do “negative work,” leading businesses to refuse to hire programmers with less than two years’ experience (no experience, no job; no job, no experience). Coding boot camps and accredited institutions also failed to provide jobs due to rapidly changing trends and low teacher salaries.

McKelvey’s knowledge of Innovation Stacks from this book became a “huge help.” Knowing they couldn’t copy the existing system, LaunchCode began with job placement. When they successfully got coders jobs, they quickly ran out of coders, forcing them to train new talent differently (faster, cheaper). They found a way to boost completion rates of online courses from 1% to over 50%, which raised costs, but they kept tuition free because they understood how price impacts entrepreneurial companies.

He acknowledges that LaunchCode isn’t a “magic cure” but understanding Innovation Stacks made them “less hesitant to act.” The journey is still scary, but they knew the pattern: “find a problem and learn how others have solved it. If nobody has, try something different even though this will feel weird. When your new solution creates new problems, repeat the process. Copy what you can, but invent when necessary. And keep going until you finally have a solution, knowing that the accolades will arrive only after they are irrelevant.” This knowledge helped them “move.”

McKelvey encourages readers not to be “dissuaded” by the billion-dollar examples in the book, emphasizing that the process works just as well for smaller problems, and is “actually easier” if a single invention suffices. He cites his friend Greg, who invented a “Tantrum Rating Committee” to quickly resolve his son’s mall tantrum, and another friend whose construction company successfully employs ex-offenders by “reworking how work works” with a five-element Innovation Stack.

He concludes by stating that reading this book doesn’t make one an expert, as “there are no experts of the new.” We all start with nothing but an unsolved problem, lacking words to describe what we do. But now, readers “see the process” of innovation and its evolution. They understand the “qualifications for true entrepreneurship” (none, beyond a willingness to start) and the rewards. He challenges readers: you can no longer say “Nothing can be done” or “I can’t do it because I am lacking [excuse].” You can only say, “I’m not going to do anything” or “I am going to solve this problem.” He urges readers to find a problem they care about, one that will drive them, and to “Go make it right. Square up.”

Key Takeaways

The core lessons of “The Innovation Stack” revolve around a revolutionary perspective on entrepreneurship:

• Entrepreneurship is the act of solving “perfect problems”: These are problems with no existing solutions, forcing true innovators to invent rather than copy. This often means serving a market segment (the “invisible army”) that established businesses ignore or exclude, leading to exponential growth.
• The “Innovation Stack” is a holistic, interlocking system of inventions: It’s not one big idea or a planned strategy, but a series of reactive, interdependent solutions to existential threats. Each innovation creates new problems, necessitating further innovation, leading to a complex, dynamic system that is incredibly difficult for competitors to copy.
• Copying is the default, but innovation is a necessity: Most businesses succeed by skillfully copying. True entrepreneurs, however, are forced to innovate because their chosen problem exists outside the “walled city” of known solutions. They copy what they can, but invent when they must, and this forced invention creates their competitive moat.
• Low price is a powerful outcome and protector: Unlike aiming for the “lowest” price by reacting to competitors, a “low” price flows from the efficiencies of an Innovation Stack. It builds deep customer trust, fosters corporate alignment, and creates a competitive advantage so wide that competitors cannot easily cross the chasm.
• “Disruption” is often a side effect, not a goal: True entrepreneurs build and expand markets by including new customers, rather than focusing on dismantling existing systems. Their focus is on the customer and the future, not on the competition or the past.
• Entrepreneurs are not born experts: They are typically “unqualified” for the industries they enter, as expertise exists only for the known. Their “audacity” (the courage to start something new) and “stubbornness” (the perseverance to keep going) are fueled by a deep personal connection to the problem they are solving.

Next actions:

• Identify your perfect problem: Look for problems that deeply bother you, especially those where existing solutions fail or exclude people. Start with personal frustrations.
• Embrace discomfort and fear: Understand that the journey will feel scary and uncertain. Practice working effectively through fear, knowing it’s a natural response to the unknown.
• Challenge conventional wisdom: Question “experts” and “best practices” when considering a new problem, as they are often rooted in the limitations of existing systems.
• Focus on the customer, not the competition: Build a product or service that delights your new customers, even if it defies industry norms. Your customers can become your strongest advocates.

Reflection prompts:

• What problem in your life or community makes you feel angry or powerless, and could that be a “perfect problem” for you to solve?
• Where in your industry or daily life are there “invisible” markets or excluded groups that could benefit from a new, inclusive solution?
• What ingrained beliefs or “how-to” lessons might be holding you back from seeing an innovative “when”?