Mario Ferrero Università del Piemonte Orientale "Amedeo Avogadro"   University of Eastern Piedmont Department of Public Policy and Public Choice Via Cavour, 84 Alessandria, 15100 ITALY   mario.ferrero@uniupo.it   http://polis.unipmn.it/hp/ferrero/index.php           JEL Areas: P0 : Economic Systems: General C7 : Game Theory and Bargaining Theory:General