This paper investigates interactions between co-worker productivity levels in a rich empirical context. Workers have unambiguous output measures, compensation that depends on individual and group output to differing degrees and potential peers beyond their immediate work group. Important...

This paper explores the effects of peers, friends, family, IQ, and academic performance, observed in the last year of high school, on earnings at ages 35 and 53. All significantly affect earnings at both ages. The effects of IQ are much smaller than asserted in, for example, The Bell Curve, and...