First Author:   Jan G. De Gooijer University of Amsterdam j.g.degooijer@uva.nl   Dept. of Quantitative Economics, Roetersstraat 11 Amsterdam, 1018WB, Netherlands   +31-20-5254244(Phone) +31-20-5254244(Fax) Second Author: Antoni Vidiella-i-Anguera Universitat de Barcelona vidiella@eco.ub.es   Dept. dEconometria, Av. Diagonal, 690 Barcelona, 08034, Spain   +34-93-4021826(Phone) +34-93-4021821(Fax)