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First Author:
 
Sergio Da Silva
Department of Economics, Federal University of Santa Catarina
professorsergiodasilva@gmail.com
 
, Brazil
 
 
 

Second Author:

Leandro Stocco
Department of Economics, University of Sao Paulo
leandrostocco@yahoo.com.br
 
, Brazil
 
 
 

Third Author:

J. Anchieta Neves
Petrobras
anchietasul@yahoo.com.br
 
, Brazil