Walid Mensi Al Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia   ,   walid.mensi@fsegt.rnu.tn             JEL Areas: E2 : Macroeconomics: Consumption, Saving, Production, Employment, and Investment: General (includes Measurement and Data) E6 : Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General