Your mind runs two systems — one fast and intuitive, one slow and effortful

Daniel Kahneman described two modes of thought: System 1, fast, automatic, and emotional, and System 2, slow, deliberate, and logical. Most judgments run on System 1's shortcuts, and System 2 only steps in when something feels effortful or wrong. This dual-process framework explains why intuition and reasoning so often give different answers to the same question.

— Daniel Kahneman, Thinking, Fast and Slow — Farrar, Straus and Giroux, 2011
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