Grisel Ayllon Tecnologico de Monterrey   Calle del Puente 222 Ejidos de Huipulco Mexico City, Tlalpan 14380 Mexico   grisel.ayllon@itesm.mx   https://sites.google.com/site/ayllongrisel/           JEL Areas: D7 : Analysis of Collective Decision-Making: General D6 : Welfare Economics: General