Late 20th century

Anarcho-Capitalism

The claim that no state is legitimate, and that every service the state provides, including law, courts, and defense, can be sold on a competitive market.

11 min

Asch's Conformity Experiments

Solomon Asch's line-judgment studies, showing that people will call an obviously wrong answer right to avoid standing alone against a unanimous group, and that a single dissenter breaks the spell.

8 min

Bowlby's theory that infants are wired to seek a caregiver's protection, and that the caregiver's responsiveness, first measured by Ainsworth's Strange Situation, sets a template for how the child expects relationships to work.

10 min

Base Rates

The prior frequency of a thing in the population, which the mind reliably ignores when handed a vivid particular.

8 min

Baumrind's Parenting Styles

A typology of how parents combine control and warmth: authoritative, authoritarian, and permissive, later joined by neglectful, each tracking a different profile of child outcomes.

7 min

Behaviorism

The movement that tried to make psychology a science of observable behavior alone, ruling the mind out of its own subject matter until the mind forced its way back in.

12 min

Bottlenecks and the Theory of Constraints

The single slowest step sets the pace of the whole system, so the only improvement that matters is the one made at the constraint.

8 min

Burnout

A syndrome of chronic, unmanaged workplace stress with three faces: exhaustion, cynicism, and a shrinking sense of what you accomplish.

10 min

Campbell's Law

The more heavily a quantitative measure is used to make high-stakes decisions, the more it corrupts and distorts the very thing it was meant to track.

8 min

Care Ethics

Morality is not first about impartial rules but about attending to, and taking responsibility for, the people we are actually bound to.

8 min

Categories and Prototypes

The finding that everyday categories are organized around best examples and graded membership, not the strict defining features the classical view assumed.

9 min

Change Blindness and Inattentional Blindness

A person in a gorilla suit can walk through the middle of your visual field, in full view, and you will swear afterward that nothing was there.

7 min

Cleavage Theory

Party systems are frozen fossils of old social conflicts: the divisions that split a society when mass democracy arrived became the party families that outlived the conflicts themselves.

10 min

Cognitive Dissonance

The discomfort of holding two cognitions that clash, and the pressure it creates to change one of them so they fit.

9 min

Communitarianism

The self is not a free-floating chooser but is constituted by community, tradition, and shared goods, so a good society must cultivate them, not merely stay neutral among them.

11 min

Confederalism

A union of states that keep their sovereignty and lend the center only the powers they choose, retaining the right to take them back.

11 min

Confirmation Bias

The tendency to seek, read, and remember evidence that fits what we already believe, and to hold the rest to a higher standard.

9 min

Consequentialism

The family of moral theories holding that an act is right if and only if it produces the best consequences, and nothing else about it matters.

9 min

Constitutionalism

The principle that government power is defined and limited by a fundamental law, standing above ordinary politics and enforced against the state itself.

11 min

Constructivism in International Relations

Anarchy is what states make of it: the interests, threats, and structures of world politics are built out of shared ideas and identities, not fixed by material power alone.

10 min

Contractarianism

Morality and politics as the output of a bargain: rules that self-interested rational agents would agree to because each does better inside the agreement than out.

7 min

Contractualism

An act is wrong if it violates any principle that no one could reasonably reject.

9 min

Conway's Law

Any organization that designs a system will produce a design whose structure copies the organization's own communication structure.

8 min

Corporatism

Society organized not as isolated individuals but as functional bodies (labour, capital, professions) bargaining with each other and the state.

9 min

Correlation and Causation

Two variables moving together tells you they are related, not that one moves the other; only a controlled experiment licenses the word 'cause.'

9 min

Critical Mass

The threshold past which a process stops needing a push and starts sustaining itself.

8 min

Crossing the Chasm

A discontinuous gap separates the visionaries who first buy a new technology from the pragmatic mainstream, and most products die in it.

8 min

Cultural Relativism

The claim that moral codes are products of particular cultures, and, in its strong form, that no culture's code is truer or better than another's.

8 min

Daniel Kahneman

The psychologist who mapped the systematic errors of human judgment and, in doing so, helped found behavioral economics.

11 min

Deliberate Practice

Skill grows not from logging hours but from focused, effortful practice at the edge of your ability, guided by immediate feedback.

8 min

Demand Characteristics

Participants and experimenters read the study's unspoken cues and bend the results toward what they think it is looking for.

8 min

Democratic Socialism

Socialism reached and kept by democratic means: not managing capitalism, but democratizing the economy itself.

11 min

Dependency Theory

Poor countries are not simply behind; they are kept poor by the very way they are plugged into the world economy.

10 min

Dilution and the Logic of Equity

Founders own a shrinking share of a growing company because each round of outside capital issues new stock, and a smaller slice of a larger, better-funded pie can be worth more than a larger slice of a starved one.

9 min

Disruptive Innovation

Incumbents lose not by managing badly but by managing well: they serve their best customers and cede the low end to cheap, inferior entrants who improve upward and displace them.

8 min

Double-Loop Learning

Errors can be fixed two ways: by adjusting the action within your existing assumptions, or by questioning the assumptions themselves.

8 min

Dual-Process Theory

The claim that judgment runs on two functionally distinct kinds of mental processing: one fast and automatic, one slow and effortful.

8 min

Dunbar's Number

There is a rough cognitive ceiling, around 150, on the number of stable social relationships one person can maintain at once.

8 min

Duverger's Law

Winner-take-all elections in single-member districts push a polity toward two parties; proportional representation lets many parties survive.

8 min

Economic Moats

A structural feature that lets a business keep earning excess returns while competition tries and fails to erode them.

9 min

Emergence

Higher-level order arising from many local interactions with no central control, so the whole comes to have properties none of its parts possess.

8 min

Entrepreneurial Alertness

Entrepreneurship is not managing resources or bearing risk but being alert to profit opportunities that everyone else has failed to notice.

8 min

Erik Erikson

Erikson mapped human development as eight lifelong crises of identity and relationship, running from an infant's first trust to the reckoning of old age.

12 min

Error Theory

Moral claims try to state objective facts, but there are no objective values, so every positive moral claim is false.

8 min

Primary text

Essence of Decision

Why a state acted depends on which model you use to look at it: a unified rational chooser, a bundle of organizational routines, or a bargain among bureaucratic players.

10 min

Executive Functions

The mind's top-down control system: the processes that hold a goal in mind, suppress the automatic response, and adjust when the situation changes.

10 min

Fascism

A revolutionary ultranationalism that promises a nation's rebirth through a total state, a supreme leader, and the cult of violence, and that in power delivered dictatorship and war.

12 min

Tradition

Feminist International Relations

The claim that international relations theory only looks universal because it hides the women who sustain it and mistakes a masculine account of power for the whole of world politics.

12 min

Flow

The state of absorbed, effortless concentration that arises when a hard task and a matched skill meet, so that action and awareness fuse and the activity becomes worth doing for its own sake.

8 min

Friedrich Hayek

The economist and philosopher who argued that dispersed knowledge makes central planning impossible and that freedom depends on the rule of law, not the rule of planners.

10 min

Gall's Law

A complex system that works is invariably found to have evolved from a simple system that worked; you cannot build a working complex system from scratch.

7 min

Gate Control Theory of Pain

Pain is not a direct readout of injury but a signal a spinal gate can amplify or dampen, which is why rubbing a hurt helps and why a lost limb can still ache.

7 min

Goal-Setting Theory

Specific, difficult goals produce higher performance than vague or easy ones, through named mechanisms and inside strict limits that, when ignored, make the same tool backfire.

9 min

Goodhart's Law

Once you turn a measurement into a target, people optimize the measurement rather than the thing it was meant to track, and the measurement goes bad.

7 min

Green Political Theory

Politics reorganized around the recognition that the economy sits inside a finite biosphere, and that nature and future generations have standing.

11 min

Groupthink

Irving Janis's theory that tight-knit, high-esteem groups under stress suppress dissent to preserve unanimity, and decide worse for it.

9 min

Hanlon's Razor

Never attribute to malice that which is adequately explained by stupidity, carelessness, or incompetence.

5 min

Hannah Arendt

A political thinker who insisted that the capacity to act freely in public, not economics or history, is the core of political life.

10 min

Humanistic Psychology

A 'third force' in psychology, founded by Maslow and Rogers against behaviorism and psychoanalysis, that studies growth, meaning, and the healthy personality rather than conditioned response or pathology.

12 min

Implicit Bias

The idea that people hold automatic, unendorsed associations that can bias judgment, and the hard, unresolved fight over whether the test that made it famous actually measures or predicts anything.

10 min

Internal and External Validity

Two questions every study faces: can we trust its causal claim on its own terms, and does that claim hold outside the study?

7 min

John Kenneth Galbraith

The economist who argued that affluent capitalism's deepest failure is not scarcity but the misdirection of abundance toward private goods and away from public needs.

9 min

John Rawls

The philosopher who revived political philosophy by asking how free and equal people could agree on the terms of a just society.

12 min

Kohlberg's Stages of Moral Development

A six-stage account of how moral reasoning matures, tested through dilemmas like Heinz and the drug he cannot afford, and famously challenged for treating one voice, justice, as the summit of maturity.

8 min

Learned Helplessness

Repeated exposure to a shock a dog cannot escape teaches it, wrongly, that nothing it does will change what happens, even later when escape is easy.

9 min

Levels of Explanation

Any information-processing system can be described at three separate levels (what problem it solves, by what procedure, and in what physical stuff), and picking the wrong level guarantees the wrong explanation.

9 min

Liberal Democracy

Majority rule fenced in by individual rights: the people choose their rulers, but the rulers cannot do just anything the majority wants.

11 min

Libertarianism

The political philosophy that liberty is the highest value, that individuals own themselves, and that the state must be kept as small as protecting those rights allows.

12 min

Little Albert

The 1920 study in which two psychologists conditioned an infant to fear a white rat, a landmark of behaviorism and one of the most ethically indefensible experiments in the field's history.

8 min

Localization of Function

The claim that specific mental functions are carried out by specific, identifiable parts of the brain.

8 min

Loss Aversion

Losses hurt more than equivalent gains feel good, so people fight harder to avoid losing than to win the same amount.

9 min

Maoism

A revolution built not on the industrial worker but on the poor peasant, seized through protracted guerrilla war and kept permanently boiling by mass campaigns from above.

12 min

Market Socialism

Keep the market as the way goods get allocated, but move the ownership of firms out of private hands and into workers or the public.

12 min

Marxism-Leninism

The official ideology of the Soviet state: Marx's theory of history refitted with Lenin's vanguard party and codified under Stalin into a doctrine of one-party rule.

12 min

Mary's Room

A scientist who knows every physical fact about color but has only seen black and white: when she first sees red, does she learn something new, and if so, is physicalism false?

10 min

Meritocracy

The rule that positions and rewards should go to the able and the hardworking rather than to the well born or the well connected.

11 min

Metacognition

Thinking about your own thinking: the capacity to monitor what you know and to steer your own learning on the strength of that judgment.

9 min

Michel Foucault

The philosopher who argued that power does not merely repress us but produces us, manufacturing the subjects, truths, and normalities we take for granted.

12 min

Milgram's Obedience Experiments

The lab studies that found most ordinary people will keep delivering apparent electric shocks to a stranger simply because a man in a lab coat tells them to continue.

10 min

Milton Friedman

The economist who made the case that free markets and sound money, not government planning, are the surest path to broad prosperity.

9 min

Minarchism

The state should do only what protects rights: police, courts, and defense, and nothing more.

11 min

Modernization Theory

The claim that the richer a country becomes, the more likely it is to become and stay a democracy.

8 min

Monetarism

Money drives prices: control the growth of the money supply by a steady rule and you tame inflation, where discretionary fine-tuning fails.

11 min

Moral Anti-Realism

The family of views denying that there are objective moral facts: our moral talk expresses attitudes, constructs standards, or is systematically false.

9 min

Moral Intuitionism

The view that some moral truths are self-evident, known directly by careful reflection rather than derived from anything more basic.

9 min

Moral Luck

Factors no one controls, from the swerve of a child into the road to the temperament you were born with, shape how much blame and praise a person actually deserves.

8 min

Moral Nihilism

The view that there are no moral facts, so no action is really right or wrong.

9 min

Moral Realism

The view that there are objective moral facts, true or false independently of what anyone thinks or feels.

9 min

Moral Relativism

The view that moral truth is not absolute but relative to a culture or an individual, so that no moral framework is objectively privileged over the others.

8 min

Murray Rothbard

The economist and philosopher who pushed libertarianism to its logical extreme, arguing that every function of the state could and should be replaced by voluntary market arrangements.

9 min

Negative Utilitarianism

The view that reducing suffering matters more than promoting happiness, or matters exclusively.

8 min

Neoliberal Institutionalism

Self-interested states, though they answer to no world government, can still cooperate because institutions cut the costs and risks of dealing with one another.

9 min

Neoliberalism

The twentieth-century revival of market liberalism: free markets, free trade, sound money, and a state that clears the way rather than steers the economy.

11 min

Network Effects

A product grows more valuable to each user as more people use it, which lets the leader pull away and often take most of the market.

8 min

Nuclear Deterrence

The paradox that a state can be made safer by holding open the certain capacity to destroy an attacker, so that no attack is worth launching.

10 min

Observational Learning

Bandura's Bobo doll studies showed that children learn new behavior, including aggression, simply by watching a model perform it and seeing what happens next.

8 min

P-Hacking and HARKing

Two ways to manufacture a discovery that is not there: keep reshaping the analysis until it clears the significance bar (p-hacking), or write the hypothesis after you already know the answer (HARKing).

8 min

Paradigms and Scientific Revolutions

Science does not grow by steady accumulation but by long stretches of settled puzzle-solving punctuated by revolutions that overthrow the framework itself.

10 min

Parkinson's Law

Work expands to fill the time available for its completion, and bureaucracies grow of their own accord regardless of the work to be done.

7 min

Populism

A thin politics that splits society into a virtuous people and a corrupt elite, and claims to speak for the people alone.

11 min

Porter's Five Forces

An industry's long-run profitability is decided by five structural forces, and strategy is the search for a position where those forces are weak and defensible.

7 min

Porter's Generic Strategies

Competitive advantage comes from being the low-cost producer or being different, aimed either broadly or at a niche; try to be everything and you end up stuck in the middle.

9 min

Positive and Negative Liberty

Two rival conceptions of freedom: freedom from interference and freedom to live a self-directed life.

7 min

Positive Psychology

Seligman's 1998 call to study what makes life worth living, not only what goes wrong with it, built into a research program on character, resilience, and gratitude that later had to reckon with its own weak replications.

11 min

Postcolonialism

The study of how colonialism reshaped culture, knowledge, and identity, and how those distortions outlasted the empires that produced them.

11 min

Power Laws and Fat Tails

In a power law a handful of events account for most of the total, the distribution has no typical size, and the rare extreme, not the average, is what dominates the outcome and the risk.

8 min

Tradition

Pragmatism

The meaning and truth of an idea lie in its practical consequences: a belief is a rule for action, and inquiry, not correspondence to a fixed reality, is where knowledge is settled.

10 min

Preference Utilitarianism

Do the most good by satisfying the most preferences, not by maximizing pleasant feelings.

9 min

Prescriptivism

Moral judgments are not reports or mere expressions of feeling but universal commands: to call an act wrong is to prescribe against it for every relevantly similar case, including your own.

8 min

Presidentialism versus Parliamentarism

The comparative-institutions argument over whether the executive should stand on its own popular mandate and fixed term (presidentialism) or emerge from and answer to the legislature (parliamentarism).

9 min

Probabilistic Thinking

Treat beliefs as probabilities to be sized and updated, not as certainties to be defended.

8 min

Problem-Solving Heuristics

The rules of thumb people use to search for a solution when no guaranteed procedure exists, and the fixed habits of mind that can make those shortcuts fail.

7 min

Procedural Justice

Justice may lie not in the outcome but in the fairness of the process that produced it.

7 min

Psychiatric Classification

The project of sorting mental suffering into named, criteria-based categories, useful enough to build a field on and contested at every level, from whether clinicians agree on it to whether the categories are real.

8 min

Public Goods

A public good is one that everyone can use without reducing what remains for others, and from which no one can practicably be excluded.

7 min

Reconstructive Memory

Memory rebuilds an event each time it is recalled, and information encountered afterward can be woven into that rebuild until people sincerely remember what never happened.

7 min

Representative Democracy

Government in which the people rule not by voting on policies themselves but by electing representatives who govern in their name and answer to them at the next election.

11 min

Robert Nozick

The philosopher who argued that only a minimal state can be just, because individuals have rights so strong that no pattern of distribution may override them.

11 min

Rule Utilitarianism

Do not ask what this act would do; ask what would happen if everyone followed the rule it falls under, and follow the rules whose general acceptance would produce the most good.

9 min

Schelling's Segregation Model

Mild individual preferences for similar neighbors produce extreme collective segregation.

3 min

Second-Order Thinking

Ask not just what an action does, but what happens after that: the consequences of the consequences.

8 min

Second-Wave Feminism

The claim that women's inequality lives not only in law but in the everyday structures of home, work, sex, and self: the personal is political.

11 min

Securitization

Security is not a fact about the world but a move in politics: to call something an existential threat is to claim a license for emergency action.

10 min

Selective Attention

The mind can attend to only a fraction of what reaches the senses, and how it chooses, by a filter at the ears or by turning down what it ignores, is the central puzzle of early attention research.

9 min

Self-Determination Theory

The theory that people are healthiest and most durably motivated when three basic needs, autonomy, competence, and relatedness, are met, and that external rewards can crowd out the internal motivation they aim to boost.

8 min

Self-Efficacy

The belief that you can carry out the specific actions a situation demands, which shapes whether you attempt it, how hard you try, and how long you persist.

8 min

Signal Detection Theory

A framework separating how well you can tell signal from noise from how willing you are to say yes when unsure.

7 min

Signaling

When quality is hidden, a signal is credible only if it costs the impostor more than it costs the genuine article.

8 min

Sleep and Dreaming

Sleep is a structured, actively regulated brain state cycling through distinct stages, and dreams are the mind's activity within it, explained by rival theories no one has settled.

10 min

Social Capital

The stock of trust, reciprocity, and social connection that lets people cooperate, and that Putnam argued was quietly draining out of American life.

10 min

Social Democracy

Reform capitalism from within: keep the market, but harness it with a strong welfare state, universal services, and organized bargaining, all pursued by the ballot rather than the barricade.

11 min

Social Entrepreneurship and the Triple Bottom Line

Run an enterprise to solve a social problem, and judge it on three accounts, people, planet, and profit, not on financial return alone.

8 min

Social Facilitation and Social Loafing

Other people can make you try harder or slacker: their mere presence sharpens easy tasks and spoils hard ones, while being pooled anonymously into a group makes everyone quietly ease off.

10 min

Social Identity Theory

The theory that sorting people into groups, even trivial and arbitrary ones, is enough by itself to make them favor their own group.

10 min

Soft Power

Soft power is getting others to want what you want, through the pull of your culture, values, and legitimacy, rather than through force or payment.

8 min

Split-Brain Research

When the cable joining the two hemispheres is cut, each half of the brain can perceive, decide, and act on its own, and the talking half calmly invents reasons for what the mute half just did.

8 min

Sternberg's Triangular Theory of Love

Love is built from three components (intimacy, passion, and commitment) whose presence or absence yields eight recognizable kinds of love.

8 min

Structural Realism

State behavior is driven by the structure of an anarchic system and the distribution of power within it, not by human nature or the kind of regime a state has.

10 min

Supererogation

The morally good beyond the call of duty: acts that are praiseworthy to do but not blameworthy to omit.

8 min

SWOT Analysis

A planning grid that sorts what you know about a decision into four boxes: internal Strengths and Weaknesses, external Opportunities and Threats.

7 min

Technocracy

Rule, or at least decisive rule-setting, handed to experts and technical criteria rather than to elected generalists or popular will.

10 min

The Acts and Omissions Distinction

The contested claim that doing harm is morally worse than merely allowing the same harm to happen.

8 min

The Adolescent Brain

The theory that teenage recklessness comes from timing: a reward and social system that matures early, running ahead of a self-control system that matures late.

10 min

The Bargaining Model of War

Because war is costly, a settlement both sides prefer should almost always exist, so war is a failure of bargaining, not its natural outcome.

7 min

The BCG Matrix

A 2x2 that sorts a company's businesses by market growth and relative market share to decide which to feed, which to milk, and which to sell.

8 min

The Big Five Personality Traits

Five broad, statistically independent dimensions, openness, conscientiousness, extraversion, agreeableness, and neuroticism, that keep reappearing whenever personality description is factor-analyzed.

9 min

The Biology of Stress

The body's response to threat is a two-speed cascade, a nervous surge and a hormonal one, that saves us from acute danger and wears us down when it never shuts off.

9 min

The Biopsychosocial Model

Illness and disorder arise from biology, psychology, and social circumstance interacting at every level, and diathesis-stress spells out the mechanism: a vulnerability that only becomes disorder under enough strain.

8 min

The Brain in a Vat

How could you tell, from the inside, that you are not a disembodied brain in a tank being fed a lifelike stream of fake experience?

8 min

The Bystander Effect

The more people who witness someone in trouble, the less likely any one of them is to help, because each assumes someone else will.

8 min

The Chinese Room

A man who processes Chinese by rulebook without understanding a word shows that running the right program is not the same as understanding.

9 min

The Circle of Competence

Know the perimeter of what you truly understand, and operate strictly inside it, because the boundary matters far more than the size.

7 min

The Civic Culture

Stable democracy rests less on formal institutions than on a particular mix of citizen attitudes: engaged but deferential, participant but trusting.

9 min

The Cognitive Model of Emotion

It is not events that upset us but our interpretation of them, and systematic distortions in that interpretation produce distress.

7 min

The Cognitive Revolution

The mid-century shift, led by Chomsky, Miller, and Neisser, that put unobservable mental states back on psychology's table after fifty years in which behaviorism had ruled them out of bounds.

8 min

The Dodo Bird Verdict

The recurring finding that competing psychotherapies, tested head to head, produce roughly equal outcomes, suggesting shared ingredients matter more than technique.

8 min

The Drowning Child

If you would ruin your suit to save a child drowning in front of you, why does a child dying far away have a weaker claim on you?

8 min

The Dunning-Kruger Effect

The claim that the least competent tend to overrate themselves the most, because the skills needed to do well are the same skills needed to judge how well you did.

10 min

The Eisenhower Matrix

Sort your tasks by importance and urgency, and you will find that the work that matters most is rarely the work that is shouting loudest.

6 min

The Elaboration Likelihood Model

Persuasion travels one of two routes, careful thought about the argument or a shortcut around it, depending on whether the audience is able and motivated to think.

8 min

Tradition

The English School

States form not merely a system but a society, bound by shared institutions that produce order among them without any government above them.

12 min

The Experience Machine

Nozick's machine offers a lifetime of perfect experiences; most people refuse it, which suggests we want more from life than how it feels from the inside.

8 min

The Feynman Technique

To understand something, explain it in plain words as if to a beginner; where you stall or reach for jargon, you have found what you do not actually know.

8 min

The Fundamental Attribution Error

The tendency, when judging others, to blame their character and discount their circumstances.

9 min

The Garcia Effect

Rats made sick hours after tasting sweet water learned to avoid the sweetness alone, a result that broke the rule that any cue can be conditioned to any consequence.

7 min

The Gettier Problem

A short 1963 paper showed that a belief can be true, and justified, and still not count as knowledge, breaking a definition that had stood since Plato.

9 min

The Hard Problem of Consciousness

Why does any physical process in the brain feel like something from the inside, rather than going on in the dark?

9 min

The Impossible Trinity

A country can have a fixed exchange rate, free capital movement, and independent monetary policy, but only two of the three at once.

8 min

The Johari Window

A four-pane map of the self, split by what you know about yourself and what others know about you, used to widen the shared, honest space between people.

7 min

The Levels-of-Analysis Problem

The same international event can be explained at the level of the individual, the state, or the system, and choosing a level is a prior commitment that decides what will even count as a cause.

9 min

The Lindy Effect

For things that do not age, the longer they have already survived, the longer they can be expected to survive: age is evidence of durability.

8 min

The Median Voter Theorem

Under majority rule on a single issue dimension, vote-seeking candidates are pulled toward the position of the median voter.

8 min

The Mere Addition Paradox

Parfit's step-by-step trap: adding happy people is not bad, and equalizing while raising welfare is good, yet repeating these steps proves a huge population of barely worthwhile lives is best.

8 min

The Nash Equilibrium

A situation in which no player can do better by unilaterally changing their own strategy, given what everyone else is doing.

8 min

The Need to Belong

The drive to form and keep lasting, caring bonds is a basic human need whose frustration harms mind and body.

9 min

The Norm Life Cycle

A three-stage account of how a moral standard goes from the claim of a few activists to a rule almost no one questions: emergence, cascade, internalization.

7 min

The Original Position

The imagined choosing situation, behind the veil of ignorance, in which free and equal parties pick the principles that will govern their society.

9 min

The Paradox of Voting

If one vote almost never decides an election, a purely self-interested person should not bother to vote, yet millions do.

9 min

The Person-Situation Debate

Walter Mischel's demonstration that personality traits predict behavior far more weakly across situations than assumed, and the interactionist synthesis it eventually produced.

9 min

The Peter Principle

In a hierarchy, people are promoted until they reach a job they cannot do, and then they stay there.

7 min

The Placebo Effect

The measurable change in a person that follows an inert treatment, driven not by the treatment but by expectation, conditioning, and the ritual of being cared for.

10 min

The Policy Window

Policy change happens when three separate streams (problems, policies, and politics) are joined by an entrepreneur during a brief window of opportunity.

8 min

The Principal-Agent Problem

Whenever one person acts on another's behalf but wants different things and cannot be fully watched, their interests drift apart, and closing the gap is never free.

8 min

The Prisoner's Dilemma

Two rational actors, each acting in their own interest, reach an outcome that is worse for both than if they had cooperated.

9 min

The Psychology of Attraction

Attraction is not random: proximity, similarity, and physical attractiveness are the three predictors that decades of research keep confirming.

10 min

The Repugnant Conclusion

If total welfare is what matters, an enormous population of lives barely worth living beats a small population of wonderful ones, and Parfit found every escape route blocked.

9 min

The Rubicon Model

Action runs through four phases split by a single point of no return, the moment you decide, and each side of that line demands a different frame of mind.

8 min

The Security Dilemma

Under anarchy, the steps a state takes to make itself safer can make others less safe, so they arm in reply and everyone ends up more exposed, even when no one intended harm.

8 min

The Stages of Grief

Five stages, denial, anger, bargaining, depression, acceptance, that Elisabeth Kübler-Ross described in the dying and the public later mistook for a map of how everyone grieves.

8 min

The Stanford Prison Experiment

A six-day Stanford simulation in which student guards turned abusive, taken for decades as proof of situational power until 2018 archives showed the abuse was coached, not spontaneous.

8 min

The Swiss Cheese Model

Accidents happen not because one defense fails but because the holes in many defenses momentarily line up to let a hazard through.

8 min

The Ticking Time Bomb

A hypothetical bomb, a captured terrorist, and a clock: the scenario built to make torture look not only permissible but obligatory.

8 min

The Tragedy of the Commons

A shared resource, left unregulated, tends toward ruin because each user gains by taking more even as collective overuse destroys it.

7 min

The Trolley Problem

A pair of near-identical dilemmas designed so that our intuitions diverge, forcing us to say what actually makes killing wrong.

10 min

The Universality of Facial Expressions

Paul Ekman's claim that a handful of basic emotions wear the same face in every culture, and the unsettled scientific fight over whether the evidence actually supports it.

7 min

The Veil of Ignorance

A device for finding just rules: choose the principles of your society without knowing who in it you will be.

9 min

The Working Memory Model

Short-term memory is not one holding pen but a small team: an executive that directs attention, a sound-based loop, a visual sketchpad, and a buffer that binds them into experience.

7 min

Theory of Mind

The capacity to attribute mental states, beliefs, desires, intentions, to others and to grasp that theirs can differ from your own and from reality.

9 min

Third-Wave Feminism

The feminism that abandoned the universal 'woman' for difference, intersectionality, and individual agency.

11 min

Totalitarianism

The attempt to seize total control of society, ideology, and the inner life through one party, terror, propaganda, and an official truth.

11 min

Transnational Advocacy Networks

When a government blocks its own citizens, they route around it: appealing to allies abroad who pressure the state from outside, so the demand comes back home like a boomerang.

8 min

Trotskyism

The revolutionary Marxism of Leon Trotsky: workers' revolution must be permanent and international, and the Stalinist USSR was a workers' state betrayed by its bureaucracy.

12 min

Two-Level Games

International negotiation is a game played at two tables at once: bargaining with foreign counterparts while selling any deal back home.

7 min

Unit Economics

Judge a business one customer at a time: if it loses money on each customer, growth makes it worse, not better.

8 min

Veto Players

Policy change requires the agreement of every actor whose consent is needed to pass it; the more of them there are, the more ideologically distant, and the less internally unified, the harder change becomes.

9 min

War Made the State

Modern states were built not by contract or design but as the by-product of rulers scrambling to fund war: to fight, they had to tax, and to tax they had to build bureaucracy.

9 min

What Is It Like to Be a Bat?

There is something it is like to be a conscious creature, and Thomas Nagel argues that this inside view is exactly what a purely physical description of the brain can never capture.

9 min