[1]College of Administration, Economics and Accounting, Federal University of Goifs - UFG, Brazil;
[2]Department of Economics, Administration and Sociology, College of Agriculture, University of Sao Paulo Scientific Coordinator at Center for Advanced Studies and Applied Economics （CEPEA/ESALQ/USP）, Brazil;
[3]Department of Economics, Administration and Sociology, College of Agriculture, University of Sao Paulo Researcher at Advanced Studies and Applied Economics （CEPEA/ESALQ/USP）, Brazil （ESALQ/USP） and （ESALQ/USP） and;
