Mental models

100 People Love

Paul Graham

Build something 100 people love rather than something 1 million people kind of like. Intensity of need beats breadth of appeal.

7 Powers (Hamilton Helmer)

Hamilton Helmer

The seven — and only seven — sources of durable competitive advantage: Scale Economies, Network Economies, Counter-Positioning, Switching Costs, Branding, Cornered Resource, and Process Power.

BATNA

Roger Fisher / William Ury

Best Alternative to a Negotiated Agreement — your power in any negotiation comes not from persuasion, but from the strength of your walk-away option.

Competition is for Losers

Peter Thiel

Peter Thiel's thesis: every moment spent competing is a moment not spent building something unique. The goal is to escape competition entirely.

Disagree and Commit

Once a decision is made after genuine debate, everyone — including dissenters — commits fully to execution. Solves the paralysis of consensus-seeking.

Disruptive Innovation

Clayton Christensen

Inferior products in niche markets that improve until they overtake incumbents.

Distribution

How products reach customers matters more than the product itself.

Lollapalooza Effects

Charlie Munger

When multiple cognitive biases or forces act in the same direction simultaneously, the combined effect isn't additive — it's multiplicative. Recognising these confluences is essential for predicting extreme outcomes.

Do Things That Don't Scale

Paul Graham

The best startups are built through unscalable, hands-on work first.

Extreme Ownership

Jocko Willink

Leaders own everything in their world — no excuses, no blaming subordinates.

Forcing Function

Constraints deliberately introduced to compel desired behaviour.

Founder-Market Fit

Chris Dixon

The founder's unique fit to the problem determines startup success more than any other factor.

Growth vs Fixed Mindset

Carol Dweck / Claudia Mueller

Abilities develop through effort and learning, not innate talent alone.

Availability Heuristic

Kahneman & Tversky

We judge the likelihood of events based on how easily examples come to mind, not on actual frequency. Dramatic, recent, or emotionally vivid events get massively overweighted.

Hook Model

Nir Eyal

The four-phase cycle that builds habitual product usage.

Innovator's Dilemma

Clayton Christensen

Good management is the reason great companies fail when disruption arrives.

Iteration Velocity

John Boyd

The team that learns fastest wins — speed of iteration is the ultimate advantage.

Jobs to Be Done

Clayton Christensen

People hire products to accomplish specific functional, emotional, and social jobs.

Luck Surface Area

Jason Roberts / Seneca / Louis Pasteur / Naval Ravikant

Increase exposure to serendipity by doing more and telling more people.

MVP

Frank Robinson / Steve Blank / Eric Ries

The smallest thing that tests your riskiest assumption.

Moats

Warren Buffett / Hamilton Helmer

Durable competitive advantages that protect long-term profitability from competitive erosion.

Asymmetric Payoffs

Nassim Nicholas Taleb

Seek situations where the upside is uncapped and the downside is limited. The expected value of a decision depends not just on probability but on the magnitude of outcomes in each direction.

Network Effects

Robert Metcalfe

Value increases with each additional user, creating exponential competitive advantage.

Platform Business Model

Sangeet Paul Choudary / Geoffrey Parker / Marshall Van Alstyne

Connect distinct user groups and create value through network orchestration.

Porter's 5 Forces

Michael Porter

Some industries print money. Others burn it. The difference is rarely about the talent inside the companies or the quality of their products. It is about the structure of the...

Product/Market Fit

Andy Rachleff / Marc Andreessen

When customers buy faster than you can build — the only thing that matters.

Red Queen Effect

Leigh Van Valen

You have to run as fast as you can just to stay in the same place. In competitive environments, standing still means falling behind because everyone else is improving.

Asymmetric Risk

Nassim Nicholas Taleb

Not all risks are equal. Some decisions carry small downside with enormous upside; others carry catastrophic downside with modest upside. The shape of the risk matters more than its probability.

Pygmalion Effect

Robert Rosenthal / Lenore Jacobson

High expectations create high performance through self-fulfilling prophecy.

Positioning

Michael Porter / Al Ries & Jack Trout

Where you compete matters more than how hard you compete. Choosing the right strategic position — the intersection of your strengths, customer needs, and competitive gaps — determines most of the outcome.

Radical Candor

Kim Scott / Sheryl Sandberg

Care personally and challenge directly — feedback that builds trust and drives improvement.

Reversible vs Irreversible Decisions

Jeff Bezos

One-way doors demand deliberation. Two-way doors demand speed.

Choosing Important Problems

Richard Hamming

The most important decision in any career or research agenda is which problems to work on. Working hard on the wrong problem is worse than working moderately on the right one.

Simplify

Simplification is the ultimate sophistication and competitive advantage.

Start With Why

Simon Sinek

Communicate purpose before product — people buy why you do it, not what you do.

Strategy vs Tactics

Roger Martin

Strategy decides where to play. Tactics decide how to execute.

Sustainable Competitive Advantage

Michael Porter

Advantages that persist because competitors cannot easily replicate them.

Switching Costs

The higher the cost of leaving, the stronger the moat.

Two Pizza Rule

Jeff Bezos / Frederick Brooks

Small autonomous teams outperform large ones — keep teams feedable by two pizzas.

Viral Marketing

Sabeer Bhatia / Jack Smith

When each user brings more than one new user, growth becomes exponential.

Zero to One

Peter Thiel

Create something new rather than copying what exists — aim for monopoly, not competition.

Abstraction

Edsger Dijkstra

Hide complexity behind simpler interfaces to reason at higher levels.

Explore-exploit Tradeoff

Balance gathering new information against leveraging what you already know.

Metcalfe's Law

Robert Metcalfe / George Gilder

Network value grows proportionally to the square of connected users.

Moore's Law

Gordon Moore / Carver Mead

Transistor counts double every two years, driving exponential computing gains.

Mythical Man Month

Frederick P. Brooks Jr.

Adding people to a late project makes it later.

Technical Debt

Ward Cunningham

Expedient decisions create compounding costs that must be repaid.

Barriers to Entry

Joe Bain / Michael Porter

Structural obstacles preventing new competitors from entering a market.

Collective Action Problem

Mancur Olson

Individual incentives to free-ride undermine cooperation for shared benefit.

Comparative Advantage

David Ricardo

Specialize where your opportunity cost is lowest, not where you are best.

Creative Destruction

Joseph Schumpeter

Innovation destroys established industries to create new, more valuable ones.

Economies of Scale

Larger scale drives lower unit costs, creating compounding cost advantages.

First-Mover

Marvin Lieberman / David Montgomery

Being first creates switching costs and brand recognition but bears exploration risk.

Game Theory

John von Neumann / Oskar Morgenstern

Strategic interaction where outcomes depend on all participants choices.

Increasing Returns

W. Brian Arthur

Early advantages compound through positive feedback into winner-take-most outcomes.

Information Asymmetry

George Akerlof

Unequal information between parties creates adverse selection and moral hazard.

Jevons Paradox

William Stanley Jevons

Efficiency improvements increase total consumption rather than reducing it.

Moral Hazard

Kenneth Arrow

Insulation from consequences encourages excessive risk-taking.

Nash Equilibrium

John Nash

No player can improve by unilaterally changing strategy.

Opportunity Cost

Frédéric Bastiat

The true cost of any decision is what you gave up to get it.

Prisoner's Dilemma

Merrill Flood / Melvin Dresher / Albert Tucker

Individual self-interest produces worse outcomes than cooperation.

Skin in the Game

Nassim Nicholas Taleb

Decision-makers must bear consequences to align incentives.

Supply and Demand

Prices adjust to balance what producers supply and consumers buy.

The Agency Problem

Adam Smith / Michael Jensen / William Meckling

Agents with different incentives make suboptimal decisions for principals.

Tragedy of the Commons

William Forster Lloyd / Garrett Hardin

Individual self-interest depletes shared resources, harming everyone.

Winner Take All Market

Sherwin Rosen

Small advantages lead to disproportionate concentration of rewards.

Barbell Strategy

Nassim Nicholas Taleb

Concentrate at extremes of safety and risk, avoid the mediocre middle.

Circle of Competence

Buffett & Munger

You have an edge in some domains and not others — and the boundary between the two is where most catastrophic decisions happen. Knowing where your knowledge actually ends, not where your confidence ends, is the single most protective mental model.

Discounted Cash Flow

John Burr Williams

Value equals future cash flows discounted to present value.

Margin of Safety

Benjamin Graham

Buy below intrinsic value to protect against errors and the unforeseen.

5 Whys

Sakichi Toyoda

Ask why five times to find the systemic root cause.

All Models Are Wrong

George Box

Every model simplifies reality; the question is whether it is useful.

Amara's Law

Roy Amara

Overestimate technology short-term, underestimate it long-term.

Eisenhower Decision Matrix

Dwight D. Eisenhower

Sort tasks by urgency and importance to focus on what truly matters.

First Principles Thinking

Aristotle / Elon Musk

Strip a problem to its fundamental truths and reason up from there — the antidote to reasoning by analogy.

Goodhart's Law

Charles Goodhart

When a measure becomes a target, it ceases to be a good measure.

Law of Triviality

C. Northcote Parkinson / Poul-Henning Kamp

Groups spend disproportionate time on trivial issues they understand.

Map vs Territory

Alfred Korzybski

Models are not reality; confusing the two leads to systematic errors.

Occam's Razor

Among competing explanations, prefer the simplest one.

Paradigm Shift

Thomas Kuhn

The old framework is replaced by an entirely new way of seeing.

Parkinson's Law

C. Northcote Parkinson

Work expands to fill the time available for its completion.

Principle of Falsification

Karl Popper

A claim is only useful if it can be proven wrong.

Regret Minimization Framework

Jeff Bezos

Decide by asking which choice you would regret least at age 80.

Scientific Method

Observation, hypothesis, experiment, and revision produce reliable knowledge.

Second-Order Thinking

Howard Marks

Think past the immediate effect to the second and third-order consequences.

Deep Work

Cal Newport

Sustained concentration on demanding tasks produces disproportionate value.

Deliberate Practice

K. Anders Ericsson

Structured practice targeting specific weaknesses drives elite performance.

Flow State

Mihaly Csikszentmihalyi

Optimal consciousness where challenge and skill match produces peak performance.

Spaced Repetition

Hermann Ebbinghaus

Review at expanding intervals to beat the forgetting curve.

Bayes Theorem

Bayes / Price / Laplace / Fisher

Update your beliefs proportionally to how surprising the new evidence is — the foundation of rational inference.

Black Swan Theory

Nassim Nicholas Taleb

Rare, unpredictable events with extreme impact shape history.

Compounding

Einstein

Exponential growth from consistent small gains over long time horizons.

Correlation vs Causation

Moving together does not mean one causes the other.

Ergodicity

What works across many simultaneously may not work for one across time.

Exponential Growth

Growth accelerates proportionally to current size, slow then explosive.

Fermi Problem

Enrico Fermi

Break impossible questions into tractable sub-problems for useful estimates.

Global & Local Maxima

The best nearby outcome may trap you from reaching the best possible outcome.

Inversion

Carl Jacobi / Charlie Munger

Think backwards: instead of asking how to succeed, ask what guarantees failure — then avoid it.

Kelly Criterion

John Kelly Jr.

Optimal bet sizing maximizes long-term wealth growth while avoiding ruin.

Nonlinearity

Outputs not proportional to inputs; small changes can produce massive effects.

Power Law Distribution

Vilfredo Pareto

A small number of items account for a disproportionate share of outcomes.

Probabilistic Thinking

Thomas Bayes / Nate Silver

Replace binary judgments with probability estimates under uncertainty.

Probability Theory

Pascal / Fermat / Kolmogorov

The mathematical framework for quantifying uncertainty.

Regression to the Mean

Francis Galton

Extreme outcomes are followed by more moderate ones as luck fades.

Signal vs Noise

Claude Shannon

Distinguish meaningful information from irrelevant data.

Asymmetric Warfare

Andrew Mack / Ivan Arreguín-Toft

Weaker forces use unconventional tactics to neutralize stronger opponents.

Blitzkrieg

Heinz Guderian

Concentrated rapid attack at the point of greatest vulnerability.

Fabian Strategy

Quintus Fabius Maximus

Avoid decisive battle to exhaust a stronger opponent through patience.

Fog of War

Carl von Clausewitz

Incomplete information makes reality impossible to see clearly in real time.

Mission Command

Specify intent and objectives; leave tactical execution to those closest.

Mutually Assured Destruction

Robert McNamara

Both sides can inflict unacceptable damage, making conflict irrational.

OODA Loop

John Boyd

Cycle through observe-orient-decide-act faster than competitors.

Red Team

Paul Van Riper

Structured adversarial challenge from the opponents perspective.

Scorched Earth

Destroy resources to deny them to an advancing adversary.

Trojan Horse

Embed offensive capability inside something targets willingly accept.

Adaptation & Red Queen Effect

Leigh Van Valen

Continuous adaptation is required just to maintain relative position.

Complex Adaptive Systems

Murray Gell-Mann

Many interacting agents self-organise to produce emergent behaviour.

Critical Mass

Thomas Schelling

The tipping-point threshold where a process becomes self-sustaining.

Entropy

Rudolf Clausius / Ludwig Boltzmann

All ordered systems tend toward disorder unless energy is continuously invested.

Flywheel

Jim Collins

Self-reinforcing momentum built through consistent effort in one direction.

Incentives

Charlie Munger / Adam Smith

People respond to rewards and punishments, not instructions.

Inertia

Newton / Galileo

Systems resist change proportional to their accumulated mass.

Laws of Thermodynamics

Energy transforms but never appears from nothing — every conversion has a cost.

Leverage (Physics)

Archimedes

A small force at the right point moves disproportionately large loads.

Momentum

Isaac Newton

Mass times velocity — once moving fast and heavy, nearly impossible to stop.

Natural Selection & Extinction

Charles Darwin

Survival belongs to the fit, not the strong — adapt or face extinction.

Newton's Laws

Isaac Newton

Three laws of motion governing force, mass, acceleration, and reaction.

Path Dependence

Paul David / Brian Arthur

Early decisions constrain all future possibilities — history matters.

Systems Thinking

Jay Forrester

Examine interconnections and feedback loops, not isolated components.

Thermodynamics

Every system has an energy budget — ignore the metabolic cost and it dies.

Stoicism

Zeno of Citium / Epictetus / Seneca / Marcus Aurelius

Focus on what you control, accept what you cannot, build virtue.

The Socratic Method

Socrates

Systematic questioning to expose assumptions and clarify thinking.

Thucydides Trap

Thucydides / Graham Allison

Rising power vs ruling power — structural stress makes conflict the default.

Anchoring

Kahneman & Tversky

First information encountered disproportionately shapes all subsequent judgements.

Bandwagon Effect

People adopt trends because others have — popularity self-reinforces.

Bystander Effect

John Darley / Bibb Latané

More witnesses means less action — responsibility diffuses across groups.

Cognitive Dissonance

Leon Festinger

Contradictions between beliefs and actions drive rationalisation over change.

Confirmation Bias

We seek evidence that confirms what we already believe and filter out what contradicts it.

Curse of Knowledge

Colin Camerer / George Loewenstein / Martin Weber

Knowing something makes it impossible to imagine not knowing it.

Decision Fatigue

Shai Danziger / Roy Baumeister

Decision quality deteriorates after sustained choices — willpower is finite.

Dunning-Kruger Effect

David Dunning & Justin Kruger

Low competence breeds overconfidence; expertise breeds doubt.

Endowment Effect

Thaler / Kahneman / Knetsch

Ownership inflates perceived worth beyond objective value.

Framing Effect

Tversky & Kahneman

How you frame the question determines the answer you get.

Fundamental Attribution Error

Lee Ross

We blame character when circumstances are the real cause.

Groupthink

Irving Janis

Cohesive groups suppress dissent and converge on flawed decisions.

Halo Effect

Edward Thorndike

One positive trait colours evaluation of everything else.

Hindsight Bias

Baruch Fischhoff

After the fact, people believe they knew it all along.

IKEA Effect

Michael Norton / Daniel Mochon / Dan Ariely

Labour invested inflates perceived worth regardless of quality.

Incentive-Caused Bias

Charlie Munger

Show me the incentive and I will show you the outcome.

Lollapalooza

Charlie Munger

Multiple biases combining in the same direction produce extreme outcomes.

Loss Aversion

Kahneman & Tversky

Losses hurt roughly twice as much as equivalent gains feel good.

Narrative Fallacy

Nassim Nicholas Taleb

We compress complex reality into clean stories, mistaking explanation for prediction.

Peak-End Rule

Kahneman / Redelmeier / Katz

Experiences are judged by their peak moment and their ending.

Planning Fallacy

Kahneman / Tversky

People systematically underestimate time, cost, and risk of projects.

Self-Fulfilling Prophecies

Robert K. Merton

Beliefs alter behaviour in ways that make the belief come true.

Social Proof

Robert Cialdini

When uncertain, people copy what others are doing.

Status Quo Bias

William Samuelson / Richard Zeckhauser

Loss aversion applied to change makes inaction the default choice.

Sunk Cost Fallacy

Alfred Marshall

Past investments should not drive future decisions.

Survivorship Bias

Abraham Wald

Studying only survivors produces systematically wrong conclusions.

Antifragility

Nassim Nicholas Taleb

Some systems gain from disorder — growing stronger from shocks.

Emergence

Stuart Kauffman / John Holland

Complex wholes arise from simple parts interacting — the whole exceeds the sum.

Feedback Loops

Norbert Wiener / Jay Forrester

Outputs feed back as inputs, creating either amplifying or stabilizing dynamics.

Gall's Law

John Gall

Working complex systems evolve from working simple systems.

Leverage (Systems)

Donella Meadows

Small shifts at the right point produce outsized systemic changes.

Margin of Safety (Systems)

Redundancy and slack let systems absorb unexpected shocks.

Resilience

C.S. Holling

Systems that absorb disturbance and reorganise while maintaining function.

Second-Order Effects

Consequences of consequences often dominate the intended outcome.

Stock and Flow

Stocks accumulate, flows change them — stocks determine behaviour.

Theory of Constraints

Eliyahu Goldratt

Only one constraint matters — optimising anything else is an illusion.

10x Individuals/Teams

Sackman / Erikson / Grant / Steve Jobs / Robert Cringely

In 1968, Sackman, Erikson, and Grant published a study in Communications of the ACM measuring programmer performance on identical tasks. The best performers finished 10 times...

12 Standard Forms of Value

Josh Kaufman

Every business that has ever generated revenue — from a lemonade stand in Phoenix to a $3 trillion company in Cupertino — delivers value in one of twelve fundamental ways. Not a...

5 Parts of Every Business

Josh Kaufman

In 2005, Spanx had one employee, one product, and $10 million in annual revenue. Sara Blakely was creating value (footless pantyhose no one else made), marketing it (cold-calling...

A/B Testing

A/B testing is controlled experimentation applied to product and business decisions. Show half your users a green checkout button and half a red one. Measure which group converts...

AARRR

Dave McClure

Dave McClure stood on a stage in Seattle in 2007 — an Ignite talk, five minutes, twenty slides that auto-advanced every fifteen seconds — and introduced a framework that would...

Ability to Raise Prices

Warren Buffett

Warren Buffett sat in front of the Financial Crisis Inquiry Commission in 2010 and reduced decades of investment philosophy to a single sentence: "The single most important...

Abundance vs Scarcity Mindset

Stephen Covey / Reid Hoffman / Jeff Bezos

Stephen Covey drew the line in 1989. In The 7 Habits of Highly Effective People, he described two fundamentally different orientations toward opportunity. The scarcity mindset...

Active Listening

Carl Rogers / Richard Farson

In 1957, psychologists Carl Rogers and Richard Farson published a short monograph titled Active Listening that introduced a deceptively simple idea: most people do not listen to...

Addressability

Every pitch deck has a TAM slide. Total Addressable Market — that big, round number in the top-right corner meant to signal the size of the opportunity. $50 billion. $120 billion....

Agile

Kent Beck / Ken Schwaber / Jeff Sutherland / Alistair Cockburn / Martin Fowler

In February 2001, seventeen software developers gathered at the Lodge at Snowbird ski resort in Utah. They represented competing methodologies — Extreme Programming, Scrum,...

Amazon Narratives

Jeff Bezos

In 2004, Jeff Bezos sent an email to his senior team banning PowerPoint from Amazon. The replacement: six-page narrative memos, read in silence at the start of every significant...

Attribution Theory

Fritz Heider / Harold Kelley

In 1958, Austrian psychologist Fritz Heider published The Psychology of Interpersonal Relations and proposed something that sounds obvious until you realise how badly most people...

Bait and Switch

Every airline runs the same play. The fare is $49. By the time you've selected a seat, checked a bag, and paid the booking fee, the total is $187. The original price was never the...

Barrier to Competition

Most strategists know about barriers to entry — the obstacles that prevent new players from entering a market. Fewer think carefully about a different and often more important...

Brand

Brand is not a logo. It is not a colour palette, a tagline, or a mission statement printed on a conference room wall. Brand is the sum of associations, expectations, and emotions...

Bullseye Framework

Gabriel Weinberg / Justin Mares

Gabriel Weinberg had a problem. He had built DuckDuckGo — a search engine that competed with Google on privacy — and the product worked. Users who tried it liked it. But users...

Bundling and Unbundling

Jim Barksdale

Jim Barksdale, the CEO who navigated Netscape through the browser wars, told his board something that most business strategists still haven't fully absorbed: "There are only two...

Business Case

A business case is a structured argument for why a proposed initiative deserves resources — time, capital, people. It answers five questions: What is the problem? What is the...

CRM

CRM — Customer Relationship Management — is not software. It is the systematic practice of capturing, organising, and leveraging every interaction with a customer to make the next...

Capital Allocation Options

William Thorndike

Every dollar a business generates faces the same six-way fork: reinvest in existing operations, acquire other businesses, pay down debt, issue dividends, buy back shares, or hold...

Commandos vs Infantry vs Police

Robert X. Cringely

Robert X. Cringely buried one of the sharpest organizational insights of the twentieth century inside a book about the personal computer industry. In Accidental Empires (1992),...

Common Ground

Fisher & Ury

In 1981, Roger Fisher and William Ury published Getting to Yes: Negotiating Agreement Without Giving In and introduced a distinction that should have ended a century of...

Confidence: Speed vs Quality

Jeff Bezos

In his 2016 letter to shareholders, Jeff Bezos made an observation that should be pinned to the wall of every conference room where decisions stall: "Most decisions should...

Consequence vs Conviction

Jeff Bezos

Jeff Bezos drew a 2×2 matrix on a whiteboard at an Amazon all-hands meeting in the early 2010s and changed how the company made every significant decision. One axis measured the...

Core Competency

C.K. Prahalad / Gary Hamel

In 1990, C.K. Prahalad and Gary Hamel published "The Core Competence of the Corporation" in Harvard Business Review and permanently changed how strategists think about competitive...

Costly Signalling Theory

Amotz Zahavi

In 1975, Israeli biologist Amotz Zahavi proposed an idea that turned evolutionary theory sideways. His handicap principle stated that the most reliable signals in nature are the...

Dark Patterns

Harry Brignull

In 2022, the Federal Trade Commission filed a complaint alleging that Amazon had spent years designing its Prime cancellation flow to be deliberately confusing. The internal name...

Diffusion of Responsibility

John Darley / Bibb Latané

In a room of twelve executives, a critical metric is flashing red on the dashboard. Every one of them sees it. None of them acts. Not because they're negligent, and not because...

Directly Responsible Individual

Steve Jobs

Every Monday morning at Apple, the executive team files into a conference room for a three-hour meeting. The agenda covers every significant product, project, and initiative...

Disconfirming Evidence

Darwin / Wason / Munger

Charles Darwin kept a special notebook. Not the famous ones cataloguing finch beaks and barnacle anatomy — a different notebook, dedicated to a single purpose: recording every...

Economically Valuable Skills

Cal Newport

Cal Newport published "So Good They Can't Ignore You" in 2012 and dismantled the most popular career advice of the past fifty years: follow your passion. His counter-argument was...

Expert Problem

Philip Tetlock / Nassim Taleb

Philip Tetlock spent twenty years tracking 28,000 predictions made by 284 experts — political scientists, economists, intelligence analysts, journalists — across domains where...

FOMO Components

In January 2021, GameStop stock rose from $17 to $483 in three weeks. The fundamental value of a struggling brick-and-mortar video game retailer had not changed. What changed was...

FUD

Fear, Uncertainty, and Doubt — FUD — is the competitive strategy of spreading negative, vague, or misleading information about a rival to slow their adoption. The mechanism is not...

Feedback

Kim Scott / Ray Dalio

Every leader knows they should give more feedback. Almost none of them do. The gap between knowing and doing is where organisational dysfunction compounds — silently, invisibly,...

Field Testing

Drew Houston

Focus groups loved New Coke. Two hundred thousand blind taste tests confirmed that consumers preferred the new formula to both old Coke and Pepsi. Coca-Cola launched with total...

Five Fits Framework

Roger Martin & A.G. Lafley

Most companies do not have a bad strategy. They have five disconnected strategies. The product team has a vision. The sales team has a target market. The operations team has a...

Float

Warren Buffett

Float is other people's money that sits in your account before you have to pass it on — and the returns you earn on it in the meantime. The concept is simple. The consequences are...

Fostering Culture

Edgar Schein

Culture is not a mission statement on the wall, a set of values on the careers page, or a foosball table in the break room. Culture is the set of behaviours that get rewarded,...

Founder's Syndrome

Every trait that makes someone a great founder — pathological conviction, breakneck speed, centralised decision-making, appetite for risk that would hospitalise a normal executive...

Framing (Business)

Tversky & Kahneman

How you present information shapes decisions more than the information itself. This is not a psychological curiosity — it is the most leveraged skill in business. The same...

Free

Chris Anderson / Larry Page / Sergey Brin

Free is not the absence of a business model. It is a business model — and in digital markets, it is often the most aggressive competitive weapon available. Chris Anderson's 2009...

Freemium

Fred Wilson

Give the product away for free. Charge for the better version. Venture capitalist Fred Wilson named this model in a March 2006 blog post — "freemium" — and in doing so...

Freeroll

A freeroll is a bet where you cannot lose but might win. The downside is zero or negligible. The upside is real and potentially enormous. The term comes from poker — specifically,...

Gallup Q12

Gallup spent thirty years and 2.7 million employees trying to answer one question: what separates the best workplaces from the worst? The answer was not compensation, perks,...

Gamification

Take the mechanics that make games compulsive — points, levels, badges, leaderboards, progress bars, streaks — and embed them in products that have nothing to do with games. That...

Generalist vs Specialist

Anders Ericsson / Malcolm Gladwell / David Epstein

Two books, published twenty years apart, frame the central tension of human performance. Anders Ericsson's research — popularised in Malcolm Gladwell's Outliers (2008) and...

Heat-seeking Missiles

Andy Rachleff

Andy Rachleff — co-founder of Benchmark Capital and founding CEO of Wealthfront — distilled a pattern he observed across hundreds of venture-backed startups into a metaphor that...

High-context vs Low-context

Edward T. Hall

In 1976, anthropologist Edward T. Hall published Beyond Culture, introducing a framework that divided the world's cultures along a single axis: how much of the message lives...

Horizons Framework

Mehrdad Baghai / Stephen Coley / David White

Every company is running three businesses at once — whether it knows it or not. Horizon 1 is the core: the current business that generates today's revenue and profit. Horizon 2 is...

Hunting Elephants vs Flies

Christoph Janz

Christoph Janz published a blog post in 2014 that became one of the most referenced frameworks in SaaS investing. The title was simple: "Five Ways to Build a $100 Million...

Hype Curve

Jackie Fenn

In 1995, Jackie Fenn — an analyst at Gartner — published a research note that introduced a visual framework for tracking how new technologies evolve in public perception. She...

Idea Maze

Balaji Srinivasan

In 2013, Balaji Srinivasan introduced a concept during Stanford's Startup Engineering course that should have changed how every investor evaluates founders and how every founder...

Improving Returns

Theodore Wright

Most business models suffer from diminishing returns. The first million dollars in revenue is cheap to acquire. The second costs more. The tenth costs dramatically more — because...

Intellectual Property

Intellectual property — patents, trademarks, trade secrets, and copyrights — is the legal architecture that turns ideas into excludable assets. The theory is straightforward: you...

Iron Law of Market

Marc Andreessen / Bill Gross

Marc Andreessen said it plainly in 2007: "The #1 company-killer is lack of market." Not lack of talent. Not lack of capital. Not lack of product vision. Market. The statement is...

Key Failure Indicator

Every company tracks KPIs. Revenue growth, customer acquisition cost, net promoter score, monthly active users — the dashboards glow green when things go well and amber when...

Law of Shitty Click Through Rates

Andrew Chen

In 2012, Andrew Chen published an essay that named something every growth team already felt in their bones but hadn't articulated cleanly. He called it the Law of Shitty Click...

Linear Commerce

Web Smith

In 2018, Web Smith — founder of 2PM Inc. and one of the sharpest voices in digital commerce analysis — published an essay that named a business model most people could feel but...

Listen Decide Communicate

Satya Nadella / Jeff Bezos

The sequence is the model. Listen. Decide. Communicate. Three verbs, fixed order, no substitutions. Most leaders get the ingredients right and the recipe wrong — they decide...

Loss Leader Strategy

King Gillette

Costco sells its rotisserie chicken for $4.99. It has held that price since 2009 despite poultry costs rising over 40%. The company loses approximately $30–40 million per year on...

Marginal Gains

Dave Brailsford

In 2003, Dave Brailsford took over as performance director of British Cycling. The programme was, by any objective measure, a national embarrassment. British riders had won...

Meta-cognition: IQ vs EQ

Daniel Goleman / Peter Salovey / John Mayer / David McClelland / Richard Boyatzis

In 1995, Daniel Goleman published Emotional Intelligence and detonated a quiet bomb under the meritocratic assumption that cognitive horsepower determines who leads and who...

Mind Share

Al Ries / Jack Trout

Mind share is the percentage of consumer awareness or recall that a brand owns within its category. When someone says "search," they think Google. "Electric car" triggers Tesla....

Modularity

Clayton Christensen

Clayton Christensen called it the Law of Conservation of Attractive Profits: when one layer in a value chain becomes modular and commoditised, the adjacent layer becomes integral...

Narrative

Ben Horowitz / Elon Musk

Stories are how humans compress complexity into meaning. A narrative is not decoration layered on top of facts. It is the structure through which facts become intelligible — the...

Nudge Theory

Richard Thaler / Cass Sunstein

A nudge is any element of choice architecture that alters people's behaviour in a predictable way without forbidding any options or significantly changing their economic...

Only Paranoid Survive

Andy Grove

In 1985, Andy Grove was losing. Intel — the company he had co-founded — was haemorrhaging money in the memory-chip business that had defined it since 1968. Japanese manufacturers...

Open vs Closed Platform

In 1981, IBM made a decision that would define the personal computer industry for four decades. Under pressure to ship a PC before Apple ran away with the market, IBM's engineers...

Organisational Debt

Steve Blank

Steve Blank coined the term in a 2015 blog post, and the framing was deliberately borrowed from engineering: organisational debt is the accumulation of changes that leadership...

Perceived Value

Rory Sutherland

A hospital charges $5 for an aspirin tablet. The factory that manufactured it sold the same tablet for $0.03. Same molecule, same dosage, same therapeutic effect — a 167x price...

Peter Principle

Laurence J. Peter

In 1969, Laurence J. Peter published a book that read like satire but operated as diagnosis. The Peter Principle stated a law of hierarchical organisations so simple it felt...

Pivot

Eric Ries / Stewart Butterfield

Eric Ries defined it precisely in The Lean Startup (2011): a pivot is a structured course correction designed to test a new fundamental hypothesis about the product, strategy, or...

Point of Market Entry

Where you enter a market determines your entire strategic trajectory. Not what you build. Not how well you execute. Where you start. The entry point defines which customers you...

Premature Optimisation

Donald Knuth

In 1974, Donald Knuth published "Structured Programming with go to Statements" in Computing Surveys. The paper contained a sentence that would become the most quoted maxim in...

Racecar Growth Framework

Lenny Rachitsky

Lenny Rachitsky spent seven years at Airbnb — the last four leading growth for the supply side of the marketplace, where he was responsible for scaling the host base from tens of...

Remarkability

Seth Godin

Seth Godin published Purple Cow in 2003 with an argument that felt like provocation and turned out to be prophecy: in a world of brown cows, only a purple cow gets noticed. The...

Repeatable Systems

Ray Kroc / Atul Gawande

McDonald's is not in the food business. It is in the systems business. Ray Kroc did not invent the hamburger. He did not invent the french fry, the milkshake, or the drive-through...

Schlep Blindness

Paul Graham

In January 2012, Paul Graham published a short essay that named something every experienced startup investor already knew but had never articulated precisely. Schlep blindness....

Seek Feedback Not Consensus

Jeff Bezos

The distinction is surgical. Feedback is information. Consensus is permission. A leader who seeks feedback is gathering signal to make a better decision. A leader who seeks...

Segmentation

Wendell R. Smith

Not all customers are equal. The sentence sounds obvious — but most companies operate as though it isn't true. They build one product, set one price, run one marketing campaign,...

Servant Leadership

Robert Greenleaf

In 1970, Robert Greenleaf — a retired AT&T executive — published an essay called "The Servant as Leader" that inverted the default assumption about power. The conventional model:...

Shadow Testing

Nick Swinmurn / Drew Houston

In 1999, Nick Swinmurn walked into shoe stores in the San Francisco Bay Area, photographed pairs of shoes on display, listed the photos on a rudimentary website, and waited to see...

Six Sigma

Bill Smith / Jack Welch

In 1986, an engineer at Motorola named Bill Smith had a problem. Motorola's pagers and mobile phones were failing at rates that customers noticed and competitors exploited. The...

Solve Whole Customer Experience

Steve Jobs / Elon Musk

Steve Jobs did not build the best computer. He built the best experience of owning a computer. The distinction is everything. When Jobs returned to Apple in 1997, the company sold...

Span of Control

Lyndall Urwick / Jeff Bezos

How many people can one manager actually manage? The question sounds administrative. It is architectural. The answer determines the shape of the entire organisation — how many...

Strategy Tax

Ben Thompson

Every company has strategic commitments — the core business model, the platform it protects, the revenue engine it depends on, the ecosystem it promised investors it would build....

T-Shaped Employees

Tim Brown / David Guest

Tim Brown, CEO of IDEO, gave the concept its clearest articulation in a 2005 essay for Design Management Journal: the vertical bar of the T is deep expertise in a single...

Team of Teams

Stanley McChrystal

In 2003, General Stanley McChrystal took command of the Joint Special Operations Command in Iraq and discovered that the most capable military force in history was losing to an...

The Third Story

Douglas Stone / Bruce Patton / Sheila Heen

In 1999, Douglas Stone, Bruce Patton, and Sheila Heen — members of the Harvard Negotiation Project — published Difficult Conversations: How to Discuss What Matters Most and...

Three Dimensions of Negotiation

David Lax / James Sebenius

Most people think negotiation is what happens at the table. Two sides, a room, a set of demands, a set of concessions. Anchoring, framing, reading body language, knowing when to...

Time Horizon

Jeff Bezos / Warren Buffett

The length of time over which you evaluate a decision changes which decision is rational. Not which decision feels right. Which decision is right. A $1 billion investment in cloud...

Time Value of Shipping

Brandon Chu / Jeff Bezos

Brandon Chu, VP of Product at Shopify, articulated a principle that experienced operators know intuitively but rarely state with precision: every day you don't ship is a day of...

Trust

Stephen Covey / Warren Buffett

Stephen Covey's The Speed of Trust distilled an observation that every operator knows but few quantify: trust is an economic accelerant. When trust is high, speed goes up and...

Unicorn Candidate

Patrick Collison / Reed Hastings / Steve Jobs

Stripe's internal hiring bar, as Patrick Collison has described it repeatedly, reduces to a single question: "Will this person raise the average quality of the team?" Not meet it....

Unknown Unknowns

Donald Rumsfeld

On February 12, 2002, Donald Rumsfeld stood at a Department of Defense press briefing and delivered a sentence that was mocked, parodied, and ultimately recognised as one of the...

Value Chain Analysis

Michael Porter

A company is not one thing. It is a sequence of activities, each of which adds some portion of the value that customers ultimately pay for — and each of which consumes some...

Value Stream

Taiichi Ohno

In 1950, a Toyota engineer named Taiichi Ohno walked the factory floor and asked a question that would reshape global manufacturing: where does the time actually go? Not the...

Vanity Metrics

Eric Ries

In 2011, Eric Ries published "The Lean Startup" and introduced a term that should have killed the startup pitch deck as we knew it: vanity metrics. A vanity metric is any number...

Visualization

Edward Tufte / Florence Nightingale / Charles Minard

Edward Tufte's central principle is deceptively simple: the best way to understand complex data is to see it. Not to read about it, not to hear it summarised, not to receive a...

Win-Win

Roger Fisher / William Ury

Roger Fisher and William Ury published Getting to Yes in 1981 and changed how the world negotiates. The book's central argument: most negotiations fail not because the parties...

Wisdom of Crowd

Francis Galton / James Surowiecki

In 1906, Francis Galton attended a livestock fair in Plymouth where 787 people paid sixpence each to guess the weight of an ox. Galton — an elitist who believed expertise should...

Black Box

A black box is a system whose internal workings are hidden or irrelevant: you observe inputs and outputs, not mechanism. The term comes from control theory and systems...

Clarke's Third Law

Arthur C. Clarke

Arthur C. Clarke's third law: "Any sufficiently advanced technology is indistinguishable from magic." The line appears in his 1973 revision of Profiles of the Future. The point is...

Constraint Relaxation

Constraint relaxation is a problem-solving move: temporarily drop or loosen a constraint to make a hard problem tractable, then reintroduce the constraint and adapt the solution....

Design Pattern

Gamma / Helm / Johnson / Vlissides

A design pattern is a reusable solution to a recurring problem in a context. The term was popularised in software by the Gang of Four (Design Patterns: Elements of Reusable...

Divide and Conquer

Divide and conquer is a strategy: break a problem into smaller subproblems of the same kind, solve them (often recursively), then combine the solutions. In algorithms, merge sort...

Exponential Backoff

Exponential backoff is a retry strategy: after a failure, wait before retrying, and increase the wait each time — often doubling it (1s, 2s, 4s, 8s, …) until a cap or success. The...

Filter Bubble

Eli Pariser

A filter bubble is an information environment shaped by algorithms (and choices) so that you see more of what you already prefer or believe and less of what would challenge or...

Information Cascade

Bikhchandani / Hirshleifer / Welch

An information cascade occurs when people abandon their private signal and copy the observed actions of others, so that later actors learn nothing from the choices of those before...

Look-Then-Leap Rule

The look-then-leap rule is an optimal stopping strategy: spend a defined phase gathering information (look), then commit when a threshold is reached (leap). It comes from the...

Mechanism Design

Leonid Hurwicz / Eric Maskin / Roger Myerson

Mechanism design is the reverse of game theory: instead of analysing the outcome of given rules, you choose the rules so that self-interested participants are led to an outcome...

Moravec's Paradox

Hans Moravec / Marvin Minsky

Moravec's paradox is the observation that the hard problems for humans are often easy for machines, and the easy problems for humans are often hard for machines. Reasoning,...

Parallel Processing

Parallel processing is doing multiple units of work at the same time instead of one after the other. In computing, it means executing instructions or tasks concurrently across...

Recursion

Recursion is when a process or structure is defined in terms of itself: a function calls itself, a structure contains a smaller instance of the same structure, or a problem is...

Adverse Selection

George Akerlof

In 1970, George Akerlof published "The Market for Lemons," a thirteen-page paper that nearly didn't get published — three journals rejected it as trivial — and that won him the...

Bertrand Paradox

Joseph Bertrand

In 1883, the French mathematician Joseph Bertrand reviewed Antoine Augustin Cournot's work on duopoly theory and identified a devastating implication that Cournot had missed. If...

Bottlenecks

Eliyahu Goldratt

In 1984, an Israeli physicist named Eliyahu Goldratt published a business novel called The Goal. The protagonist, Alex Rogo, manages a failing manufacturing plant. His mentor,...

Coase Theorem

Ronald Coase

In 1937, a 27-year-old British economist named Ronald Coase asked a question that no one in his profession had bothered to answer: why do firms exist? If markets are the most...

Common Knowledge

Robert Aumann / David Lewis

In Hans Christian Andersen's "The Emperor's New Clothes," every citizen privately knows the emperor is naked. The swindlers' con has already failed at the individual level — no...

Competitive Destruction

Warren Buffett once observed that the airline industry has destroyed more shareholder value than it has created since the Wright Brothers flew at Kitty Hawk. That sentence...

Complements & Substitutes

Two products are complements when consuming more of one increases demand for the other. They are substitutes when consuming more of one decreases demand for the other. The...

Conspicuous Consumption

Thorstein Veblen

Thorstein Veblen coined the term "conspicuous consumption" in The Theory of the Leisure Class (1899) to describe spending that signals status rather than satisfies material need....

Counterfactuals

A counterfactual is a "what if" — a scenario that did not happen but could have. "If Kennedy had lived, would the Vietnam War have ended differently?" "If Blockbuster had acquired...

Deadweight Loss

Deadweight loss is the value that disappears when a market is distorted — the trades that would have happened at the equilibrium price but do not happen when a tax, subsidy, price...

Diminishing Utility

The first unit of something you consume gives you more satisfaction than the second. The second gives more than the third. Each additional unit adds less utility than the one...

Division of Labour

Adam Smith / Karl Marx

Adam Smith opened The Wealth of Nations (1776) with a pin factory. One worker making pins from start to finish could produce twenty per day. Ten workers, each specialising in one...

Economic Rent

David Ricardo

Economic rent is income above opportunity cost. David Ricardo defined it in 1817: farmers pay for land's productivity, not the landlord's effort. The landlord collects rent...

Elasticity

How responsive is quantity to price? Price elasticity of demand answers that question with a single ratio: the percentage change in quantity demanded divided by the percentage...

Evolutionarily Stable Strategy

John Maynard Smith

John Maynard Smith introduced the concept in 1973: a strategy that, once adopted by a population, cannot be invaded by an alternative. Game theory meets evolution. An...

Expected Utility Theory

Von Neumann & Morgenstern

Von Neumann and Morgenstern (1944) formalised rational choice under uncertainty: maximise expected utility, not expected value. The formula is Σ (probability × utility). A 50%...

Free-rider Problem

Paul Samuelson

When a benefit is shared and your contribution is hard to observe, the rational move is to contribute nothing and take the benefit anyway. That is the free-rider problem. The good...

Gresham's Law

Sir Thomas Gresham

When two forms of money are legally required to be accepted at the same face value but have different intrinsic values, the bad money circulates and the good money disappears....

Income & Substitution Effects

John Hicks / Roy Allen

When a price changes, demand doesn't just move — it splits. The substitution effect is the shift between goods caused by changed relative prices: as one good becomes cheaper...

Keynesian Beauty Contest

John Maynard Keynes

In The General Theory (1936), John Maynard Keynes described a newspaper contest: readers pick the six prettiest faces from a hundred photos. The prize goes to whoever matches the...

Law of Diminishing Returns

Turgot / Ricardo / Marshall

Adding more of one input, while holding others fixed, eventually yields smaller and smaller increments of output. The first worker on an empty factory floor adds a lot. The...

Marginal Cost/Benefit

Decisions are made at the margin. The question is never "should we do this at all?" in the abstract — it is "should we do one more unit?" Marginal benefit is the extra benefit...

Market Power

Market power is the ability to set price above marginal cost without losing so much volume that the move destroys value. In perfect competition, price equals marginal cost and...

Market for Lemons Problem

George Akerlof

When sellers know more about quality than buyers, and buyers can't tell good from bad before purchase, the market can collapse toward low quality. Sellers of good products can't...

Matthew Effect

Robert K. Merton

The rich get richer; the poor get poorer. Success breeds success; failure compounds. The name comes from the Gospel of Matthew: "For to everyone who has, more will be given; but...

Perfect Competition

Perfect competition is a benchmark: many buyers and sellers, identical products, free entry and exit, full information. No single participant can move price. Each firm faces a...

Positive & Negative Externalities

An externality is a cost or benefit that falls on parties outside a transaction. The buyer and seller do not bear — or do not capture — the full social impact. Negative...

Price Discrimination

Price discrimination is charging different prices to different customers for the same or similar product based on willingness to pay, not cost. The goal is to capture more of the...

Public Goods

Paul Samuelson

A public good is non-rival and non-excludable. Non-rival: your consumption does not reduce mine. Non-excludable: the provider cannot practically exclude non-payers from enjoying...

Ratchet Effect

A ratchet only turns one way. In economics, the ratchet effect is the tendency for levels of effort, cost, or commitment to move up and then stick. Past performance becomes the...