0103-6831 0103-6831 S0103-68312015000100082 10.18222/eae266102859 Brazil Brazil 00 04 2015 00 04 2015 26 61 82 122

35 5 5 463-82 19 451-84 15 4 4 441-57 49 1 1 40-55 9 30 30 79-108 85 67-84 22 1 1 5-23 4 4 4 347-36 9 2 2 1-30