Sibling correlations are used as overall measures of the impact of family background and community influences on individual outcomes. While most correlation studies show that siblings are quite similar in terms of future achievement, we lack specific knowledge of what it is about family...

Using data on 19,000 whole siblings, it is shown that earnings vary significantly among students who have graduated from different colleges. The cross-section estimates are up to twice the within-family estimates, indicating that a regression estimator of college effects that does not adjust...