First Author:   Jose Angelo Divino Catholic University of Brasília jangelo@pos.ucb.br   Brasília, 70.790-160, BRAZIL   +55(61)3448-7135(Phone) +55(61)3448-7135(Fax) www.ucb.br/poseconomia Second Author: Aline Gadelha Catholic University of Brasília alinegadelha1@gmail.com