This book extends half a century of research on intuitive human judgment, the so-called heuristics and biases program. The first four decades of this research program were reviewed in Thinking, Fast and Slow, which explored the psychological mechanisms that explain both the marvels and the flaws of intuitive thinking. The central idea of the program was that people who are asked a difficult question use simplifying operations, called heuristics. In general, heuristics, which are produced by fast, intuitive thinking, also known as System 1 thinking, are quite useful and yield adequate answers.
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