The credible identification of endogenous peer group effects -- i.e. social multiplier or feedback effects -- has long eluded social scientists. We argue that such effects are most credibly identified by a randomly assigned social program which operates at differing intensities within and...

Despite the fact that the quality of education for Africans in South Africa was lower than that for whites, in 1993 the percentage wage gains associated with additional years of primary, secondary, and higher education were substantially higher for Africans than for whites. These rates increased...

Despite the lower quality of education provided Africans compared with whites in South Africa, the percentage wage gains associated with additional years of primary, secondary, and higher education are substantially larger for Africans than for whites in 1993, and they increase for both race...