Mind & psychology

Thinking, Fast and Slow

Daniel Kahneman

How quick impressions and slow checking run our judgments and choices, and where they go wrong

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  • 9 key ideas
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  • Published 2011

Introduction

Daniel Kahneman spent most of his career studying how people form judgments and make choices, much of it together with Amos Tversky. This book gathers that work for general readers in five parts and 38 chapters.

Its central picture is a mind that works in two modes. One is fast and automatic, and produces impressions and feelings. The other is slow and effortful, and checks, calculates and chooses, but it is lazy and often goes along with the first. Kahneman then walks through the shortcuts the fast mode takes and the mistakes that follow, from anchoring and easy recall to overconfidence and the way we weigh gains and losses. He ends with the gap between living an experience and remembering it.

One caution: some studies cited in the chapter on priming, the idea that words or images we have just met quietly nudge what we do next, have not held up when repeated, and Kahneman himself said in 2017 that he had put too much faith in small studies. The ideas below are drawn mostly from other parts of the book.

  1. 1The mind works in two modes: a fast one that runs by itself and a slow one that tires easily
  2. 2System 1 builds a neat story from the little it has, and what it does not see does not count
  3. 3A number we have just seen pulls our estimate toward it, even when it means nothing
  4. 4We judge what is common by what comes to mind easily, and we answer easy questions in place of hard ones
  5. 5A story that fits can feel more likely than a plain fact, even when logic says it cannot be
  6. 6We feel we understand the past and can predict the future, and both feelings are stronger than the facts
  7. 7We plan from the inside, so projects take longer and cost more than we expect
  8. 8We weigh losses more than gains, and the way a choice is framed can change what we choose
  9. 9We have a self that lives through life and a self that remembers it, and the one that remembers makes the choices

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Thinking, Fast and Slow by Daniel Kahneman: summary | Daridanesh