Esteban Induráin Public University of Navarre. Pamplona, Spain   Universidad Pública de Navarra Universidad Pública de Navarra Campus Arrosadía Pamplona, Navarra 31006 SPAIN   steiner@unavarra.es   https://www.unavarra.es/pdi?uid=17           JEL Areas: C0 : Mathematical and Quantitative Methods: General D7 : Analysis of Collective Decision-Making: General