The top 1 % of USA citizens control nearly 35% of the country's wealth and 22% of American children live in poverty. President Obama calls income inequality a defining issue and Mitt Romney tells us that the nearly half of the US population who don’t make enough to pay income taxes are failing to take responsibility for themselves. Even without election season and a flurry of statistics to remind us, the vast majority of us realize that that the USA is a pretty unequal nation. It also should not be surprising that for much of recent human history, material wealth has not been equally divided amongst members of a society. But has it ever? Is inequality part of our evolutionary heritage?

Well, yes and no.

Read more at Psychology Today.