Affiliation: | 1.Department of Economic Analysis, Facultad de Ciencias Sociales, Jurídicas y de la Comunicación, University of Valladolid, Campus María Zambrano, Plaza de la Universidad 1, 40005, Segovia, Spain ;2.Department of Economic Analysis, University of Valladolid, Valladolid, Spain ;3.Department of Applied Economics, University of Valladolid, Segovia, Spain ; |