We study how two distinct dimensions of peer ethnic diversity (ethnic fractionalization and ethnic polarization) affect occupational choice. Using longitudinal administrative data and leveraging variation in ethnic composition across cohorts within schools, we find evidence for two opposing...

If students tend to choose instructors with high teaching ability, a negative link between class size and student performance may remain obscured until this kind of sorting has been taken into account. Using data from student evaluation surveys, we confirm that it is crucial to control for...