J. Edward Taylor is Professor of Agricultural and Resource Economics at the University of California, Davis. He was an Appointed Member to the U.S. Commission on Immigration Reform from 1995-97, and is author of a number of publications on migration.Douglas S. Massey is Professor of Sociology and Public Policy at the Woodrow Wilson School of Public Policy and International Affairs, Princeton University. He is author of a number of publications on migration, Latin American society, and urban sociology.