Thinking, Fast and Slow

Daniel Kahneman • 2011

Thinking, Fast and Slow

Why It Matters

Kahneman’s landmark book explains how our “fast” instinctive System 1 and slower rational System 2 shape choices.
For loss aversion, it highlights why losses hurt roughly twice as much as gains feel good.


Key Ideas

  • Prospect Theory → losses loom larger than gains.
  • System 1 vs. System 2 → instinctive vs. deliberate thought.
  • Biases → planning fallacy, anchoring, availability heuristic.

My Take

This book reframes “irrationality” as the predictable output of ancient survival programs.
It’s foundational to Inner Caveman: our minds aren’t broken, they’re optimized for another world.


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