A sure $100 and a fifty-fifty chance for $200 are in some sense equivalent. The fact that the payoff for the risky choice is double the payoff for the sure thing exactly compensates for the fact that the chances you’ll get the payoff are halved. But if you look at the graph, you’ll see that psychologically, you won’t feel twice as good with $200 in your pocket as you will with $100 in your pocket. You’ll feel about 1.7 times as good. So to make the gamble psychologically worthwhile to you, I’d have to offer you something like $240 for a heads. Thus, Kahneman and Tversky point out, people tend
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