First Author:   Abdelkader Aguir Laboratoire ESPI2R Research in Real Estate / University of Sousse, FSEG Sousse, Lab MOFID a.aguir@groupe-espi.fr   3 rue boris vian, App18 SAINT-MARTIN-D''HÈRES, 38400, France   (+33)754599472(Phone) (+33)754599472(Fax) Second Author: Mahaman Boubacar Mohamed Salim University of Sousse, Faculty of Economics and Management of Sousse, Lab MOFID ssalimdiakite78@gmail.com