1. Lille Economie Management (LEM), University of Artois, UMR9221, Arras, France
2. CEREG, Faculty of Economics and Management, University of Yaoundé 2 SOA, Yaoundé, Cameroon
3. World Bank, Washington DC, USA
4. CERME, Faculty of Economics and Management, University of Dschang, Dschang, Cameroon