First Author:   Sergio Da Silva Department of Economics, Federal University of Santa Catarina professorsergiodasilva@gmail.com         Second Author: Newton Da Costa, Jr Department of Economics, Federal University of Santa Catarina newton@cse.ufsc.br         Third Author: Joao Tusi Department of Economics, Federal University of Santa Catarina tusi@cse.ufsc.br         Fourth Author: Andre Santos Department of Economics, Federal University of Santa Catarina andreportela@hotmail.com