First Author:   Michel C Samba University of Yaoundé 2-Soa sambamichelcyrille@yahoo.fr   Faculty of Economics and Management, University of Yaoundé 2-Soa Yaoundé, 1365, Cameroon   +237 697583422(Phone) +237 697583422(Fax) Second Author: Arthur S Mveng University of Yaoundé 2-Soa seabrook.arthur@yahoo.fr   University of Yaoundé 2-Soa, University of Yaoundé 2-Soa Yaoundé, 1365, Cameroon   +237 694653505(Phone)