Your mind has two ways of thinking — one fast and instinctive, one slow and careful — and the fast one often tricks us without our noticing.

Fast thinking acts automatically, while slow thinking requires conscious effort.

If someone suddenly throws a ball at you, your hand reacts without thinking — that is the fast mind. But solving a math problem needs the slow mind, which takes real effort. Kahneman showed that the fast mind uses shortcuts that feel logical but often lead us into mistakes.

Why it matters His ideas now shape how banks and governments design forms and warnings.