Does money buy happiness? It's sometimes said that scientists have found no relationship between money and happiness, but that's myth, says University of Illinois psychologist Ed Diener. The connection is complex. In fact, very rich people rate substantially higher in satisfaction with life than very poor people do, even within wealthy nations, he says. 'There is overwhelming evidence that money buys happiness, 'said economist Andrew Oswald of University of Warwick in England. The main debate, he said, is how strong the effect is. Oswald recently reported a study of Britons who won between $ 2, 000 and $ 250, 000 in a lottery (彩票拍奖). As a group, they showed a boost in happiness averaging a bit more than one point on a 36-point scale when surveyed two years after their win, compared to their levels two years before they won. Daniel Kahnman, a Nobel-Prize winner and Princeton economist, and colleagues, recently declared that the notion that making a lot of money will produce good overall mood is' mostly illusory'. They noted that in one study, members of the high-income group were almost twice as likely to call themselves' very happy' as people from households with incomes below $ 20, 000. But other studies, rather than asking for a summary estimate of happiness, follow people through the day and repeatedly record their feeling. These studies show less effect of income on happiness. Kahnman and colleagues said. There is still another twist to the money-happiness story. Even though people who make $ 150, 000 are considerably happier than those who make $ 40, 000 ,It's not clear why, says psychologist Richard E. Lucas of Michigan State University. Researchers conclude that any effect of money on happiness is smaller than most daydreamers assume. 'People exaggerate how much happiness is bought by an extra few thousand,' Oswald said. 'The quality of relationships has a far bigger effect than quite large rises in salary. It's much better advice, if you're looking for happiness in life, try to find the right husband or wife than to try to double your salary.' The main purpose of this passage is to discuss ______ .