intelligence predicts both income and wealth: people who are more intelligent earn more money and have a higher net worth, on average, compared with people of below-average intelligence. But intelligence does not predict happiness or unhappiness. Smart people are not happier or unhappier, on average, compared with less intelligent people. Nor does intelligence predict life satisfaction. Smarter people might have more money compared with less-smart people, on average, but they are not any more satisfied with their lives overall.
