How living in economically unequal societies shapes our minds and our social lives.

In recent decades, the economies of many countries have produced increasingly unequal outcomes for the rich and poor. This economic trend has attracted interest from members of the media, public and political classes as well as researchers who are interested in its societal implications. While this research has traditionally been the purview of economists and sociologists, there has been a burgeoning growth in research that has sought to understand the psychology of economic inequality. In this review, we summarize this work, focusing on two major themes: (1) how people perceive the scale of economic inequality and appraise its significance, and (2) how living in an economically unequal environment shapes people's social lives. Together, this work affirms claims that economic inequality is 'the defining issue of our time' (Obama, 2013) with a great deal of destructive potential. We identify important questions that await further research attention.