First Author:   Sergio Da Silva Department of Economics, Federal University of Santa Catarina professorsergiodasilva@gmail.com         Second Author: Annibal Figueiredo Department of Physics, University of Brasilia annibal@fis.unb.br         Third Author: Iram Gleria Institute of Physics, Federal University of Alagoas iramgleria@hotmail.com         Fourth Author: Raul Matsushita Department of Statistics, University of Brasilia raulmatsushita@hotmail.com