填空题 The Beatles sang that money can"t buy you love. But what about happiness? Research consistently shows that the more money people have, the 1likely they are to report 2satisfied with their lives. And that makes 3; money buys you things that make life easier and more satisfying; the 4your life, the happier you tend to be. That 5isn"t entirely linear, since there"s a limit to how 6wealth can please you; the happiness benefit of an increasing income is especially powerful 7people who don"t have much money to start with, and diminishes as wealth 8But studies also reveal that 9average income levels have risen 10time—in the U. S. and European nations, for example—residents of those countries have not reported being any happier than people 1130 or 40 years ago. It"s a paradox that 12income and happiness may be associated within a population at any given moment, overall economic growth does 13appear to correspond to a boost in national satisfaction over time.(See a gallery of things money can buy.) To understand why, researchers at the University of Warwick and Cardiff University decided to break down how individual people 14their income. What does wealth 15to people? Previous work has suggested that people tend to value their own wealth more—and are happier—when it compares favorably to everyone 16The so-called reference-income hypothesis holds that it"s not simply how much money you 17that contributes to satisfaction, 18how much more money you make than, say, the national average. The higher your salary than the norm, the happier you tend to be. That could explain in part 19populations as a whole do not experience sunnier dispositions with economic growth, since a majority of individuals may not fall above the national income 20