How much do immigration and trade affect labor market outcomes?

"This paper provides new estimates of the impact of immigration and trade on the U.S. labor market.... We examine the relation between economic outcomes for native workers and immigrant flows to regional labor markets.... We...use the factor proportions approach to examine the contributions of immigration and trade to recent changes in U.S. educational wage differentials and attempt to provide a broader assessment of the impact of immigration on the incomes of U.S. natives." Comments and discussion by John DiNardo, John M. Abowd, and others are included (pp. 68-85).