1. T. M. Friedman Professor of Economics, Stanford University, Stanford, California; Senior Fellow, Hoover Institution, Stanford, California; Research Associates, National Bureau of Economic Research, Cambridge, Massachusetts.
2. Director of Marketing Strategy, IBM Personal Computer Company, Somers, New York.
3. Stanley G. Harris Professor in the Social Sciences, Northwestern University, Evanston, Illinois; Research Associates, National Bureau of Economic Research, Cambridge, Massachusetts.
4. Paul M. Warburg Professor of Economics, Harvard University, Cambridge, Massachusetts; Research Associates, National Bureau of Economic Research, Cambridge, Massachusetts.
5. Frederic Eaton Abbe Professor of Economics, Harvard University, Cambridge, Massachusetts.