First Author:   Geraldo E. Silva jr. Department of Economics, Federal University of São Carlos gedmundos@ufscar.br   gedmundos@ufscar.br Sorocaba, 18052780, Brazil   +55-15-99104-9489(Phone) +55-15-99104-9489(Fax) https://www.economia.ufscar.br/ Second Author: Sidney M. Caetano Department of Economics, Federal University of Juiz de Fora sidney.caetano@ufjf.br   sidneymcaetano@gmail.com Juiz de Fora, 36036-900, Brazil   +55-32-99280912(Phone)   https://www2.ufjf.br/economia/