By era
19th century
59 entries
Alexis de Tocqueville
The French aristocrat who saw, earlier and more clearly than anyone, both the promise and the peril of democratic equality.
10 min
ConceptAlienation
The condition in which people are separated from their own labor, its products, their human potential, and each other by the structure of economic life.
7 min
IdeologyAnarchism
The claim that the state is not a necessary evil but an unnecessary one: that human society can be ordered by voluntary cooperation rather than by centralized coercion.
12 min
IdeologyAnarcho-Communism
Abolish the state and private property together, and let free communes distribute by need rather than by wage or price.
11 min
IdeologyAnarcho-Syndicalism
A revolutionary form of socialism in which workers seize and run the economy directly through their own federated unions, dispensing with the state altogether.
11 min
ConceptClass Struggle
The claim that the conflict between those who own the means of production and those who work them is the central dynamic of history.
7 min
Thought experimentClassical Conditioning
Pavlov's discovery that pairing a neutral signal with a reflex-triggering stimulus teaches the nervous system to treat the signal as a cause in its own right.
9 min
IdeologyCollectivism
The family of views that treats the group, not the individual, as the primary unit of value, agency, or explanation.
11 min
IdeologyCommunism
The goal of a classless, stateless, moneyless society of common ownership, and the movements, humane and murderous alike, that pursued it.
13 min
Mental modelComparative Advantage
Even if one party is better at producing everything, both gain by specializing in what they give up least to make, and trading for the rest.
8 min
ThinkerDavid Ricardo
The stockbroker who turned political economy into a deductive science, giving the world the theory of comparative advantage and the most rigorous classical account of distribution.
9 min
ConceptDefining Abnormality
The prior question beneath any diagnostic manual: what makes a mental state a disorder at all, rather than an eccentricity, a vice, or a life the culture dislikes.
8 min
Mental modelEntropy
Because disordered arrangements vastly outnumber ordered ones, any isolated system tends to slide from order to disorder, and reversing that slide always costs energy.
8 min
TraditionExistentialism
There is no fixed human essence handed down in advance; we exist first and then, through free choice, make ourselves what we are, and must invent our own meaning in a world that supplies none.
11 min
Mental modelFeedback Loops
A feedback loop is a circle of cause and effect in which a system's output loops back to change its own input, either damping the change (balancing) or amplifying it (reinforcing).
8 min
IdeologyFirst-Wave Feminism
The movement to win women's legal and political equality, above all the vote and the right to hold property.
11 min
ThinkerFriedrich Engels
Co-architect of Marxism, empirical chronicler of industrial capitalism, and the thinker who shaped how the world received Marx's ideas.
9 min
ThinkerFriedrich Nietzsche
The philosopher who diagnosed the death of God and asked what humanity could become once it stopped pretending its values came from anywhere but itself.
12 min
ThinkerG.W.F. Hegel
The philosopher who argued that reality, mind, and history unfold through contradiction toward the self-knowledge of a single Spirit.
13 min
IdeologyGeorgism
The value of land is created by the community, not the owner, so it should be taxed away and used for public needs, while labor and capital are left untaxed.
11 min
ConceptHow Memory Works
Memory is not a single faculty but a set of processes, encoding, storage, and retrieval, each of which can fail, and forgetting is what happens when one of them does.
10 min
ConceptHypnosis
A procedure that uses suggestion to produce marked changes in perception, memory, and voluntary action in willing, highly suggestible people, whose reality and mechanism are still contested.
10 min
ConceptIdiographic versus Nomothetic Approaches
The split between studying general laws that hold across people and understanding the single individual in depth.
9 min
IdeologyIndividualist Anarchism
The strand of anarchism that begins from the sovereign individual and refuses any authority, collective or state, that the individual has not chosen.
11 min
Mental modelInversion
To solve a hard problem, turn it around: instead of asking how to succeed, ask what would guarantee failure, and then refuse to do it.
7 min
ThinkerJohn Stuart Mill
The philosopher who inherited utilitarianism and liberalism, then remade both: pleasures have quality as well as quantity, and the only warrant for coercing an adult is to prevent harm to others.
12 min
ThinkerKarl Marx
The thinker who recast history as a struggle between economic classes and diagnosed capitalism as a self-undermining system built on exploited labor.
12 min
ConceptLegal Positivism
The view that whether something is law is a matter of social fact, not moral merit: legal validity and moral worth are separate questions.
10 min
IdeologyMarxism
A theory that history is driven by class struggle over the means of production, that capitalism exploits labor and sows the seeds of its own collapse, and that this points toward a classless society.
13 min
ThinkerMikhail Bakunin
The father of revolutionary anarchism, who made the destruction of the state the center of radical politics.
9 min
IdeologyModern Liberalism
The liberalism that kept individual liberty as its goal but decided that real freedom needs a material floor, and so accepted the welfare state and the mixed economy.
12 min
Mental modelMoral Hazard
When you are shielded from the downside of a risk, you take more of it than you otherwise would, because someone else pays if it goes wrong.
8 min
IdeologyMutualism
A stateless economy of independent producers who trade as equals, own only what they use, and lend to one another at cost.
11 min
Mental modelNatural Selection
Where things copy imperfectly and copies compete, the versions that survive and reproduce best come to prevail, and adaptation accumulates with no one designing it.
8 min
ConceptNature versus Nurture
The old contest between biology and upbringing dissolves once behavioral genetics shows that genes and environment do not add, they interact.
10 min
ConceptNeuroplasticity
The brain's lifelong capacity to reorganize its own structure and connections in response to experience, injury, and use.
8 min
IdeologyOne-Nation Conservatism
A conservatism that holds the propertied classes to a duty of care for the poor, so that the nation does not fracture into two.
11 min
Mental modelOpportunity Cost
The true cost of any choice is the value of the best alternative you gave up to make it.
7 min
ThinkerPeter Kropotkin
The anarchist prince who argued that cooperation, not competition, is the primary engine of evolution and the natural basis for a stateless society.
9 min
ConceptPhineas Gage and H.M.
Two brain-damaged patients, one who lost his temperament and one who lost his ability to form memories, who taught neuroscience both what a single case can prove and how easily its story gets embellished in the retelling.
9 min
ThinkerPierre-Joseph Proudhon
The first person to call himself an anarchist, who argued that property is theft, government is tyranny, and free association among equals is the only legitimate basis for social order.
8 min
Mental modelRegression to the Mean
When you measure something extreme, the next measurement tends to be less extreme, because luck does not repeat, and mistaking that drift for cause is how we fool ourselves.
8 min
ConceptSense and Reference
An expression carries two things at once: what it points at in the world (its reference) and the way it presents that thing (its sense).
9 min
ThinkerSigmund Freud
The Viennese neurologist who invented psychoanalysis and gave the modern world its working vocabulary for the unconscious mind, on evidence that most philosophers of science now judge too weak to support it.
13 min
IdeologySocial Liberalism
Liberalism that keeps liberty as its end but accepts an active state to secure the material conditions that make liberty real.
11 min
IdeologySocialism
The conviction that the major means of production should be owned and controlled in common, so that the economy serves human need rather than private profit.
12 min
ConceptStructuralism versus Functionalism
Psychology's founding argument: dissect the mind into its raw elements, or ask what mental processes do for the organism, and the second question proved the more useful science.
7 min
ConceptSurplus Value
Workers produce more value than they are paid; the difference, surplus value, is the source of capitalist profit.
7 min
IdeologyThe Austrian School
A tradition holding that a market economy coordinates the dispersed, subjective knowledge of millions through prices, in a way no central planner could match.
12 min
ConceptThe Entrepreneurial Ecosystem
Entrepreneurship concentrates in places, not firms: dense local networks of talent, capital, suppliers, and know-how create advantages no isolated company can build alone.
9 min
ConceptThe Harm Principle
The only purpose for which power can rightfully be exercised over anyone against their will is to prevent harm to others, never for their own good.
9 min
Mental modelThe Pareto Principle
A minority of causes usually accounts for a majority of effects, so effort spent on the vital few beats effort spread across the trivial many.
7 min
Mental modelThe Seven Perspectives of Psychology
Psychology explains the same behavior at seven different levels, from brain chemistry to culture, and the levels are complementary answers to different questions rather than rival theories competing for one.
5 min
Mental modelThe Spacing Effect
The same amount of study spread out over time produces far more durable learning than the same study packed into one session.
8 min
ConceptTheories of Color Vision
Two rival accounts of how the eye sees color, three receptor types versus opposed color pairs, that modern neuroscience shows are both right, at different stages of the visual pathway.
6 min
ThinkerThorstein Veblen
The sardonic outsider who revealed that economic life is driven less by rational calculation than by status, habit, and the predatory instincts of a leisure class.
9 min
ThinkerVladimir Lenin
The theorist and revolutionary who remade Marxism into a doctrine of disciplined party seizure of power, then tested it on the largest country on earth.
9 min
ConceptWeber's Law
The just-noticeable difference between two stimuli is a roughly constant fraction of their magnitude, so we perceive changes by ratio, not by absolute amount.
9 min
ThinkerWilhelm Wundt
The founder of psychology as an experimental science, whose disciplined method and two-part program were later flattened into a caricature by the student who claimed to be his heir.
9 min