1. Gordon Hanson is Peter Wertheim Professor in Urban Policy, Harvard Kennedy School, Cambridge, Massachusetts. Hanson is a Research Associate, National Bureau of Economic Research, in Cambridge, Massachusetts.
2. Pia Orrenius is Vice President and Senior Economist, Federal Reserve Bank of Dallas, Dallas, Texas. Research Associates, IZA Institute of Labor, Bonn, Germany.
3. Madeline Zavodny is Professor of Economics, University of North Florida, Jacksonville, Florida. Research Associates, IZA Institute of Labor, Bonn, Germany.