Daniel Kahneman, Nobel-winning psychologist who upended economics, dies at 90

Working with psychologist Amos Tversky, Kahneman isolated biases that distort decision-making. These include aversion to loss and how the way a question is framed can affect the answer. For example, if a health program will save 200 lives and result in 400 deaths, whether it's accepted may depend on whether its proponents highlight the lives saved or the lives lost.
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