First Author:   Arouri Mohamed El Hedi LEO & EDHEC Business School mohamed.arouri@univ-orleans.fr         Second Author: Jawadi Fredj Amiens School of Management and EconomiX-CNRS-University of Paris 10 fredj.jawadi@supco-amiens.fr   18, Place Saint Michel, 18, Place Saint Michel Amiens, 80000, France   +33.(3).22.82.24.41(Phone)   http://economix.u-paris10.fr/fr/publications/membres/detail.php?id=45