How Two Psychologists Changed Decision Science
A quiet revolution began when people started to notice that experts were often wrong in regular, predictable ways. In sports, executives using data found value in players traditional scouts had overlooked. In business, medicine, and government, the same pattern appeared again and again. The problem was not just a lack of information. The deeper problem was how human beings think.
Daniel Kahneman and Amos Tversky gave that problem a clear shape. They showed that people do not simply weigh evidence like careful machines. Instead, they use quick mental shortcuts that help them move through life but also lead them into error. These errors are not random. They happen so regularly that they can be studied.
Their work helped explain why markets can be inefficient, why doctors can miss obvious diagnoses, why investors panic, and why policy makers can be fooled by stories that feel right. It also changed the way many people think about expertise. Confidence and experience do not protect anyone from bias. In many cases, they only make the bias harder to see.
What made their story so powerful was that it was also deeply human. They were very different men who somehow created one of the most important intellectual partnerships of the twentieth century. Their friendship, rivalry, and eventual break became part of the meaning of their work. The same minds that uncovered human error were themselves full of emotion, pride, dependence, and pain.
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