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He won it for his work done over the course of many decades
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on human rationality.
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And this work was done in collaboration with Amos Tversky,
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who passed away several years ago.
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And this work entirely transformed
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the way we think about human decision-making and rationality.
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Kahneman and Tversky caused a revolution in economics,
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psychology, and the social sciences more generally,
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by causing us to shift from the idea that
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we're logical thinkers,
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who think in accord with the axioms of logic and mathematics and rationality,
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more towards the idea