JOHN ROEMER is Elizabeth S. and A. Varick Professor of Political Science and Economics at Yale University, USA. His recent books include Political Competition, Equality of Opportunity, Theories of Distributive Justice and Democracy, Education and Equality. He is a fellow of the Econometric Society and a corresponding fellow of the British Royal Academy. KOTARO SUZUMURA is Professor of Economic Systems Analysis at the Institute of Economic Research, Hitotsubashi University, Japan. His books include Rational Choice, Collective Decisions and Social Welfare