1. Department of Economics University of North Carolina at Greensboro North Carolina Greensboro USA
2. Schar School of Policy and Government George Mason University Virginia Arlington USA
3. Research Associate National Bureau of Economic Research Massachusetts Cambridge USA
4. Research Affiliate Institute of Labor Economics Bonn Germany
5. Department of Economics Andrew Young School of Policy Studies Georgia State University Research Affiliate Institute of Labor Economics Georgia Atlanta USA
6. O’Neill School of Public and Environmental Affairs Indiana University Indiana Bloomington USA