Affiliation: | (1) University of Seville, Escuela Superior de Ingenieros, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain (E-mail: mbilbao@cica.es), ES;(2) Tilburg University, Department of Econometrics and CentER, P.O. Box 90153, 5000 LE Tilburg, The Netherlands (E-mail: P.E.M.Borm@kub.nl), NL |