Douglas H Blair -
Department of Economics, University of Pennsylvania, 3718 Locust Walk CR, Philadelphia, Pennsylvania 19174 USA
Georges Bordes -
Laboratoire d'Analyse et de Recherche economiques, France
Jerry S Kelly -
Department of Economics, Syracuse University, Syracuse, New York 13210 USA
Kotaro Suzumura -
The London School of Economics, Houghton Street, London WC2A 2AE, England