1. Ashenfelter, Orley, and James J. Heckman1976 "Measuring the effect of an anti-discrimination program." Pp. 46-89 in Orley Ashenfelter andJames Blum (eds.), Evaluating the Labor Market Effects of Social Programs. Princeton: IndustrialRelations Section, Princeton University.AshenfelterMeasuring the effect of an anti-discrimination program46Evaluating the Labor Market Effects of Social Programs1976