Alfredo Valencia -Toledo Universidad of Vigo   Facultade de CC.Económicas e Empresariais. Campus Lagoas-Marcosende, s/n. Vigo, Pontevedra 36310 Spain   alfredo.valencia@uvigo.es         Primary Research Focus: Bargaining problem   JEL Areas: C7 : Game Theory and Bargaining Theory:General A1 : General Economics: General.