Many economists and sociologists have warned of the social dangers of a wide gap between the richest and everyone else. Now, a new study, which will be published in an upcoming issue of Psychological Science, a journal of the Association for Psychological Science, adds a psychological reason to narrow the disparity – it makes people unhappy. Over the last 40 years, “we’ve seen that people seem to be happier when there is more equality,” says University of Virginia psychologist Shigehiro Oishi, who conducted the study with Virginia colleague Selin Kesebir and Ed Diener o...