Adel Boughrara Department of Quantitative Methods, University of Sousse   Faculty of Law & Economic & Political Sciences Cite Erriadh 4029 Sousse-Erriadh Sousse, 4029 TUNISIA   adel.boughrara@topnet.tn             JEL Areas: C5 : Econometric Modeling: General E5 : Monetary Policy, Central Banking, and the Supply of Money and Credit: General