As recently as 1990, women of all educational levels earned about the same percent of the hourly wages of men with the same education. To the extent the gendered “wage gap” varied, college educated women enjoyed slightly more parity with men than working class women. By 2007, the wage gap varied dramatically by class. College-educated women earned a smaller percentage of the hourly income of their male counterparts, while the wage gap between working-class men and women shrunk substantially.
…The result: a change in family norms. College-educated women postpone childbearing, invest in their careers, and conduct a long search for a compatible and reliable mate.