Hichem Mediouni Mediterranean School of Business (MSB)   Les Jardins du Lac 2 Tunis, Tunis 1053 Tunisia   hichem.mediouni@msb.tn             JEL Areas: C4 : Econometric and Statistical Methods: Special Topics E2 : Macroeconomics: Consumption, Saving, Production, Employment, and Investment: General (includes Measurement and Data)