Thinking, Fast and Slow: 5 key ideas
The core ideas of Thinking, Fast and Slow, each in under a minute, written in our own words. Want the full depth? Get the book.
- IDEA 1 OF 5
Two modes of thought
One mode is fast, automatic and intuitive; the other is slow, effortful and logical.
Most judgements come from the fast one, and the slow one rarely bothers to check.
- IDEA 2 OF 5
What you see is all there is
The mind builds the most coherent story it can from whatever information is in front of it, and forgets to ask what is missing.
Before deciding, ask what you would need to know to change your mind.
- IDEA 3 OF 5
Anchors pull estimates
An arbitrary first number drags later estimates toward it, even when people know it is random.
In a negotiation, the first credible number on the table shapes the range.
- IDEA 4 OF 5
Losses hurt about twice as much
A loss feels roughly twice as strong as a gain of the same size.
That makes people refuse good bets and cling to losing positions. Frame decisions as a portfolio, not one-off wins and losses.
- IDEA 5 OF 5
Use the outside view
Plans are forecast from their best case.
Ask instead how long similar projects actually took and how often they went over budget. Start from that base rate, then adjust.
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