That’ s because of this simple formula: fewer competent and successful young men equals more single mothers. More single mothers? Well, that means more wage gap... Why do women work fewer hours than men? The answer is obvious: motherhood. Research consistently shows that women’s hours and earnings take a big hit once they have children... What can be done about this? The most obvious answer is that men take equal responsibility for the kids... That said, stably married mothers are in a much better position than their unmarried sisters to get support for longer work hours and more ambitious careers, if that is what they want.... Unless women marry less-educated men, a lot of those who want children will not be able to have them. Many others will become single mothers, who, if for no other reason than the laws of physics, won’t be able to compete on an equal footing with either men or their married peers.