One study pointed out that among the elite (excluding film stars) in the United States, only 4% of the children of mothers with college degrees are born out of wedlock. And the divorce rate among college-educated women has plummeted. Of those who first tied the knot between 1975 and 1979, 29% were divorced within ten years. Among those who first married between 1990 and 1994, only 16.5% were.
At the bottom of the education scale, the picture is reversed. Among high-school dropouts, the divorce rate rose from 38% for those who first married in 1975-79 to 46% for those who first married in 1990-94. Among those with a high school diploma but no college, it rose from 35% to 38%. And these figures are only part of the story. Many mothers avoid divorce by never marrying in the first place. The out-of-wedlock birth rate among women who drop out of high school is 15%. Among African-Americans, it is a staggering 67%.
Another study found that a college professor's kids hear an average of 2,150 words per hour in the first years of life. Working-class children hear 1,250 and those in welfare families only 620.
From Mankiw's Blog and the Economist.