1. Assistant Professor of Business Administration, Harvard Business School, Harvard University, Boston, Massachusetts.
2. Associate Professor of Policy Analysis and Management, Cornell University, Ithaca, New York.
3. Professor of Economics, Wellesley College, Wellesley, Massachusetts.
4. Associate Professor of Economics, Stanford University, Stanford, California.
5. Gund Professor of Economics and Business Administration, Harvard University, Cambridge, Massachusetts.
6. Professor of Economics, Vanderbilt University, Nashville, Tennessee, and Senior Research Fellow, University of Adelaide, South Australia.