Frederick H Wallace Universidad de Quintana Roo   Blvd. Bahía s/n, esq. I Comonfort col. del Bosque Chetumal, Quintana Roo 77019 Mexico   fwalla@uqroo.mx   http://www.dcsea.uqroo.mx/fwalla/           JEL Areas: F3 : International Finance: General E : Macroeconomics and Monetary Economics