First Author:   Claudine Desrieux ERMES and Laboratoire d''Economie du droit, University of Paris II Panthéon-Assas claudine.desrieux@u-paris2.fr   12 Place du Panthéon PARIS, 75005, FRANCE   +33(1)44 41 89 91(Phone) +33(1)44 41 89 91(Fax) Second Author: Jean Beuve IAE - University of Paris 1 and University of Paris XI jean.beuve@univ-paris1.fr   Paris, 75005, France