This paper considers the semiparametric identification of endogenous and exogenous peer effects based on group size variation. We show that Lee (2006)’s linear-in-means model is generically identified, even when all members of the group are not observed. While unnecessary in general,...

This paper investigates the effect of employment while in college on graduation, using data from the French Labour Force Surveys over the period 1992 to 2002. Using spatial variation in low-skill youth unemployment rates to circumvent the endogeneity of college employment decisions, we find a...