What if the modern, postindustrial economy is simply more congenial to women than to men? For a long time, evolutionary psychologists have claimed that we are all imprinted with adaptive imperatives from a distant past: men are faster and stronger and hardwired to fight for scarce resources, and that shows up now as a drive to win on Wall Street; women are programmed to find good providers and to care for their offspring, and that is manifested in more- nurturing and more-flexible behavior, ordaining them to domesticity. This kind of thinking frames our sense of the natural order. But what if men and women were fulfilling not biological imperatives but social roles, based on what was more efficient throughout a long era of human history? What if that era has now come to an end? More to the point, what if the economics of the new era are better suited to women?