1. Sao Paulo School of Economics, FGV, Rua Itapeva, 474/1003, Sao Paulo, SP, 01332-000, Brazil ();
2. School of Economics, University of Kent, Kennedy Building, Canterbury, Kent CT2 7NP, United Kingdom ();
3. Department of Statistics, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, RS, 91501-970, Brazil ()