1. Department of Economics, Vanderbilt University, Box 1819, Station B, 415 Calhoun Hall, Nashville, TN 37235.
2. Carnegie Mellon University Graduate School of Industrial Administration, 350 Posner Hall, Frew and Tech Streets, Pittsburgh, PA 15213, and Universitat Pompeu Fabra.
3. Department of Economics, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus, and Department of Economics, Louisiana State University.