Affiliation: | 1. Carnegie Mellon University, U.S.A.;2. University of Indiana, U.S.A. We are grateful to Holger Sieg and two referees for their comments and suggestions on the article. Thanks to seminar participants at Kansas State University, the London School of Economics, Montana State University, New York University, University College London, University of Virginia, the Society for Economics Dynamics, the Society of Labor Economics, the North American Summer Meeting of the Econometric Society, and the Southern Economics Association for helpful comments. Financial support from the National Center for Border Security and Immigration at the University of Arizona is gratefully 3. acknowledged. |