How a psychologist transformed economics
Nobel prize in economics tend to sprinkle their papers with equations. Daniel Kahneman, who died on March 27th, populated his best-known work with characters and conundrums. Early readers encountered a schoolchild with anof 150 in a city where the average was 100. Later they pondered the unfortunate Mr Tees, who arrived at the airport 30 minutes after his flight’s scheduled departure, and must have felt even worse when he discovered the plane had left 25 minutes late.
Teasing questions came easily to Kahneman, even in his sleep, according to “The Undoing Project”, a book by Michael Lewis. Some sprang from his teaching, which was not confined to ivory towers. He once explained the idea of “regression to the mean” to flight instructors in Israel’s air force. The reason pilots tended to improve after a sloppy manoeuvre was not because the instructor screamed at them, but because the chances of an improvement are higher if the prior performance was unusually bad.
Gossip was both a source of his work and an intended target. His bestselling book, “Thinking Fast and Slow”, was written not for decision-makers, but for “critics and gossipers”. Decision-makers were often too “cognitively busy” to notice their own biases. Pilots could be corrected by observant co-pilots and overconfident bosses might be chastened by whispers around the water-cooler, especially if the whisperers had read Kahneman’s book.
How did he do it? One answer is that he teamed up with Tversky, whose elegant mind was as ruthlessly tidy as his desk. They incorporated the cognitive illusions they had discovered into a model called “prospect theory”. According to this theory, people’s well-being responds to changes in wealth, more than levels. The changes are judged relative to a neutral reference point. That point is not always obvious and can be recast: a bonus can disappoint if it is smaller than expected.
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