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First Author:
 
Saïd Souam
EconomiX, UPL, CNRS, Université Paris Nanterre and CREST
souam@ensae.fr
 
Nanterre, 92001, France
 
0033625285712(Phone)
0033625285712(Fax)

Second Author:

Houda Badri
Faculté des Sciences Économiques et de Gestion de Sousse, Tunisia
houdabadri2@yahoo.com