http://campaignstops.blogs.nytimes.com/2012/03/12/the-reproduction-of-privilege/ The most shocking bit in this article: "the percentage of low income college students actually graduating by age 24 has grown by only 2.1 points, from 6.2 percent in 1970 to 8.3 percent in 2009. Among students from families in the highest income quartile, the graduation rate by age 24 has surged by 42.2 percentage points, doubling from 40.2 percent to 82.4 percent over the last four decades."