Two systems drive the way we think — one fast and intuitive, one slow and deliberate. Knowing when each fails changes how you decide.
Kahneman describes System 1, which jumps to conclusions effortlessly, and System 2, which does careful reasoning but is lazy. Most of our errors come from System 1 answering questions System 2 should have handled.
Drawing on decades of research, the book catalogues the biases that follow — anchoring, availability, loss aversion, overconfidence — and what we can do about them.
Fast intuition and slow reasoning work together, but intuition usually has the first and last word.
Any number you see first pulls your estimate toward it, even when it’s irrelevant.
Losses hurt roughly twice as much as equal gains feel good — which shapes almost every risk we take.
We build confident stories from the little information we have and ignore what’s missing.
We judge experiences by their peak and their end, not by how long they lasted.
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