Manuel Munoz-herrera University of Groningen   Grote Rozenstraat 31, Room 018 Groningen, Groningen 9712 TG The Netherlands   E.M.Munoz.Herrera@rug.nl   http://www.wix.com/manumunozh/manu           JEL Areas: C7 : Game Theory and Bargaining Theory:General D0 : Microeconomics: General