We compare winning and losing firms in lotteries for H-1B visas, matching administrative data on these lotteries to administrative tax data on U.S. firms and to approved U.S. patents. Winning one additional H-1B visa crowds out about 1.5 other workers at the firm. Additional H-1Bs have...

Card's (1990) study of the Mariel supply shock remains an important cornerstone of both the literature that measures the labor market impact of immigration, and of the “stylized fact” that immigration might not have much impact on the wage of workers in a receiving country. My recent...

This paper investigates if the ethnic skill differentials introduced into the United States by the inflow of very dissimilar immigrant groups during the Great Migration of 1880-1910 disappeared during the past century. An analysis of the 1910, 1940, and 1980 Censuses and the General Social...

The wage impact of immigration depends crucially on the elasticity of substitution between similarly skilled immigrants and natives and the elasticity of substitution between high school dropouts and graduates. This paper revisits the estimation of these elasticities. The U.S. data indicate that...