within any given country, at the lowest end of the income scale money does buy happiness: People who worry every day about paying for food and shelter report significantly less well-being than those who don’t. But once you are freed from basic needs and have entered the middle class, the relationship between wealth and happiness becomes smaller. The rich are happier on average than the middle class, but only by a little, and part of this relationship is reverse correlation: Happy people grow rich faster because, as in the marriage market, they are more appealing to others (such as bosses), and
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