1. Department of Economics, Duke University, Durham, NC 27708
2. Department of Economics, University of Kentucky, Lexington, KY 40503
3. Department of Economics, School of Social Sciences, University of Manchester, Manchester M13 9PL, United Kingdom
4. Department of Economics, Northwestern University, Evanston, IL 60208
5. Department of Economics, Johns Hopkins University, Baltimore, MD 21211
6. Department of Economics, University of Virginia, Charlottesville, VA 22904
7. W.E. Upjohn Institute for Employment Policy, Kalamazoo, MI 49007
8. Department of Statistics and Data Science, Northwestern University, Evanston, IL 60208