重要なポイント
- Two systems run your mind: fast intuition and slow reasoning
- What you see is all there is — we judge from incomplete evidence
- Losses hurt about twice as much as equivalent gains please
- The remembering self, not the experiencing self, makes your decisions
このbitの内容
- Two systems
Kahneman describes the mind as two characters. System 1 is fast, automatic, effortless — it reads emotions, completes '2+2', swerves the car.
- Heuristics and biases
When facing a hard question, System 1 quietly substitutes an easier one. 'Is this investment sound?
- Prospect theory
Kahneman's Nobel-winning work with Amos Tversky showed humans don't evaluate outcomes; we evaluate gains and losses from a reference point — and losses loom roughly twice as large as gains. This explains why we hold losing stocks too long, buy insurance and lottery tickets simultaneously, and reject fair bets.
- Two selves
Your experiencing self lives your life; your remembering self writes the story — and the story is ruled by peaks and endings, not duration. A painful procedure that ends gently is remembered as better than a shorter one that ends sharply.
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