[1
]Institute of Economics, University of Campinas, Campinas, Brazil
[2
]University of Campinas; Pythagoras St. 353, Campinas, Brazil
[3
]Federal University of Sao Paulo, Osasco, Brazil
[4
]Angelica St. 100, Osasco, Brazil
[5
]Federal University of Sao Carlos, Sorocaba, Brazil
[6
]Joao Leme dos Santos Road 110, Sorocaba, Brazil
[7
]University of Turin, Turin, Italy
[8
]Lungo Dora Siena 100/A Turin, Italy
[9
]Polytechnic School, University of Sao Paulo, Sao Paulo, Brazil
[10
]Prof Almeida Prado Av, Sao Paulo, Brazil