FORTY years ago Walter Mischel, an American psychologist, conducted a famous experiment.
He left a series of four-year-olds alone in a room with a marshmallow on the table. He told them that they could eat the marshmallow at once, or wait until he came back and get two marshmallows. Recreations of the experiment on YouTube show what happens next. Some eat the marshmallow immediately. Others try all kinds of strategies to leave the tempting treat alone.
Nothing surprising there. The astonishing part was the way that the four-year-olds' ability to defer gratification was reflected over time in their lives. Those who waited longest scored higher in academic tests at school, were much less likely to drop out of university and earned substantially higher incomes than those who gobbled up the sweet straight away. Those who could not wait at all were far more likely, in later life, to have problems with drugs or alcohol.
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