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Jorge Tovar
Jorge Tovar

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Think fast & Slow - Book review


  • It's easier to find the errors of others than to recognize own mistakes.
  • We have to be aware of biases of intuition.
  • The heuristic of judgment is prone to make mistakes.
  • Often we substitute hard questions with easier ones, without even noticing them.


We have systems to solve problems:

  • Fast: Intuition, biases, automatic, low effort
  • Slow: Logic, puzzles, complex tasks, concentrate

Section 1

The basic elements of the judgments and the decisions are based on our two systems.

  • Least effort: We use our intuition to avoid wasting energy
  • The Lazy Controller: System 1 interprets the world and make almost all the decisions until we are faced with difficult calculations o focus on the task
  • Associative machine: Primmingm, repeated fallacies are easier to be accepted
  • Cognitive ease: Repeated experience, priming idea, and good humor make things familiar, seems true, seems good, look easy
  • Conclusions: We make decisions with little information, Positive numbers are more unerring
  • Substitutions: We change the difficult question for easy ones

Section 2

Why it's too difficult to think in a statistical way

  • Law of lower numbers: Confidence when in doubt
  • Anchors: serve as a tipping point
  • Availability: available information != probability
  • Representatibility: impressions != probability

Section 3

We are prone to overestimate what we know about the world, we have an excess of confidence and an illusion of certainty

Section 4

Dialog with the discipline of the economy

Section 5

Two me. One experiment, another remember

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