0103-6831 0103-6831 S0103-68312015000100048 10.18222/eae266102940 Brazil Brazil Brazil Brazil Brazil 00 04 2015 00 04 2015 26 61 48 81

7 3 3 256-68 11 1 1 91-104 4 1 1 1-10 12 25 25 347-61 24 84 84 873-95