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Thinking, Fast and Slow

psychologydecision-makingcognitive-biasbehavioral-economicskahneman

Daniel Kahneman's 2011 synthesis of a career spent mapping how humans actually judge and choose — much of it with Amos Tversky. The book is organized around a fiction that works: System 1 (fast, automatic, associative) and System 2 (slow, effortful, lazy). System 1 is not stupid; it is the source of skilled intuition and most everyday competence. The trouble is that System 2 endorses System 1's answers without checking, especially under time pressure, ego threat, or organizational momentum.

Part I — Two systems

system-1-vs-system-2 runs the show. System 1 maintains a coherent model of the world, jumps to conclusions, and substitutes easier questions for harder ones (substitution-heuristic). WYSIATI — what you see is all there is — means absent evidence is not treated as evidence of absence; confidence tracks the coherence of the story you built, not the quality of the information (wysiati). Cognitive ease, priming, and associative machinery explain why fluency feels like truth.

Part II — Heuristics and biases

The famous triad from the 1974 Science paper, expanded:

Add causes trump statistics, regression to the mean (regression-to-the-mean) — misread as causal feedback (flight instructors, praise vs punishment), and nonregressive intuitive prediction — predictions as extreme as the evidence because substitution-heuristic equates evaluation with forecasting.

Part III — Overconfidence

Narrative fallacy (via Taleb): coherent stories after the fact. Hindsight bias (hindsight-bias) makes the past look inevitable. Illusion of validity and expert overconfidence when interviewers "know" after thin evidence. Algorithms often beat humans (inside-view-outside-view). Gary Klein's naturalistic decision making vs Kahneman's skepticism — resolved by kind vs wicked domains (joint paper with Klein).

Inside view vs outside view (inside-view-outside-view): the curriculum team estimated two years; reference class said 7–10 with 40% failure — Kahneman took eight. Planning fallacy (planning-fallacy): best-case stories, ignored base rates. Reference class forecasting and premortem (premortem) as organizational fixes. Optimistic bias as engine of capitalism — risk-taking, entrepreneurship, and disaster.

Part IV — Choices

Bernoulli's error: utility attaches to wealth states, but people feel gains and losses relative to a reference point. prospect-theory (Kahneman & Tversky, 1979): loss aversion (~2:1), diminishing sensitivity, probability weighting (overweight small probabilities). Endowment effect, fourfold pattern (certainty effect, possibility effect), framing (framing-effects), mental accounting (mental-accounting), sunk costs, disposition effect, regret and omission vs commission.

Humans are not Econs; Thaler's nudge and libertarian paternalism follow directly.

Part V — Two selves

The experiencing self lives moment by moment; the remembering self keeps score and makes decisions (experiencing-vs-remembering-self). Duration neglect, peak-end rule, colonoscopy studies — memory is not a faithful record of experience. Life satisfaction questions are answered by whatever is salient (coin on copier, recent marriage). Affective forecasting errors. Policy implication: reduce the U-index (time in unpleasant states), not only lift global life-eval scores.

Synthesis with the wiki

Kahneman grounds probability-blindness, sharpens decision-quality-vs-outcome (outcome bias), and supplies the mechanism behind inside-view-outside-view (from Range/Epstein examples). He pressure-tests deliberate-practice boundaries via expert intuition chapters. Munger's psychology-of-human-misjudgment is the investor's parallel map; Kahneman is the experimental psychologist's. Taleb's alternative-histories and narrative fallacy appear explicitly in Part III.

Entities and concepts

Entities: Daniel-Kahneman, Amos-Tversky

Concepts: system-1-vs-system-2, wysiati, substitution-heuristic, anchoring-effect, availability-heuristic, base-rate-neglect, law-of-small-numbers, regression-to-the-mean, halo-effect, hindsight-bias, planning-fallacy, premortem, prospect-theory, loss-aversion, framing-effects, mental-accounting, experiencing-vs-remembering-self