“You inched towards the dark side,” joked one behavioural economist after he read a recent column in which I hinted that his field has some merits. It was a quip that got me thinking, because behavioural economics does indeed have a dark side. Behavioural economists study the psychology of economic decision-making, and if they are any good at their task they will discover something the unscrupulous salesman could use to his advantage.
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