Census data suggests that in 1980 a college graduate could expect to earn about 38 percent more than a worker with only a high-school diploma. Since then, the difference in their wages has only widened as our economy has shifted to bestow greater and greater rewards on the well-educated. By 2000, that number was about 57 percent. By 2011: 73 percent.
These figures, though, reflect only part of the inequality that has pushed the lives of college and high school graduates in America farther apart. As the returns to education have increased, according to Stanford economist Rebecca Diamond, the geographic segregation of the most educated workers has, too — and not by neighborhood, but by entire city.