Some profess bafflement why people who have enough still want more. As if that were not fundamental to human nature. Yet wanting more is labeled “greed;” and wanting more, globally, in the form of economic growth, likewise gets tarred as a kind of greed. There are even those (like climate activist Bill McKibben) who deem economic growth a bad thing. But that’s supercilious in a world still far from the point where everyone has enough to live decently.* (And, no, redistributing all the wealth of the rich wouldn’t do it.)
It’s also argued that wealth inequality actually reduces everyone’s well-being. At least some wish that were so, to bolster their anti-wealth political agenda. But I doubt the rich are much perturbed by inequality. Indeed, there’s evidence that on average they’re stingier, less charitable, and just less nice. It’s not clear whether wealth makes one mean, or being mean helps make one richer. But either way, many (though not all) rich people feel superior and disdainful.
Getting back to happiness, what the word actually means is a big and difficult question. But people generally seem born with (or to develop) a set-point along the happiness/unhappiness spectrum, to which they tend to revert eventually after the impact of any vicissitude. One element of a happier personality is a sense of gratitude – not taking one’s blessings for granted.
Also relevant here is a set of Kenyan socioeconomic experiments reported by The Economist. In small villages, sizable cash grants were given at random (echoing the typically unequal distribution of economic growth). Recipients’ feelings of well-being measurably rose. But for neighbors, they fell, by even more. (Though all these deviations wore off after a while; the adaptation effect.)
But notably, as The Economist explained, “it was not inequality in general that bothered the unlucky, so much as a decline in their own wealth relative to the mean.” That is, their sense of well-being was governed not by their absolute wealth levels but, rather, by the comparison against their peers. The cash grants raised a village’s average wealth, making the non-recipients poorer compared not just to the recipients but to the average.