QUOTE : Social hierarchies may have been out of fashion when our ancestors lived in small-scale societies, but they surely made a comeback with agricultural settlement and the accumulation of wealth. But the tendency to subvert these vertical arrangements never left us. We’re born revolutionaries. Even Sigmund Freud recognized this unconscious desire, speculating that human history began when frustrated sons banded together to eliminate their imperious father, who kept all women away from them. The sexual connotations of Freud’s origin story may serve as metaphor for all of our political and economic dealings, a connection confirmed by brain research. Wanting to see how humans make financial decisions, economists found that while weighing monetary risks, the same areas in men’s brains light up as when they’re watching titillating sexual images. In fact, after having seen such images, men throw all caution overboard and gamble more money than they normally would. In the words of one neuroeconomist, “The link between sex and greed goes back hundreds of thousands of years, to men’s evolutionary role as provider or resource gatherer to attract women.