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First Author:
 
François-Charles Wolff
LEN-CEBS, Université de Nantes, France CNAV and INED, Paris, France
wolff@sc-eco.univ-nantes.fr
 
 
 
 
http://bonjorn.sc-eco.univ-nantes.fr/~cebs/Pages/wolff.htm

Second Author:

Mohamed Jellal
Faculté des Sciences Economiques, Rabat, Morocco and Conseils-Eco, Toulouse, France
jellalmohamed@yahoo.fr