Milton Biage Department of Economics, Federal University of Santa Catarina   Campus Universitário Trindade, Caixa Postal 476 Florianópolis, SC 88049-970 Brazil   milton@cse.ufsc.br   www.portalcse.ufsc.br           JEL Areas: E0 : Macroeconomics and Monetary Economics: General E1 : General Aggregative Models: General