Françoise Okah efogo FSEG - University of Yaounde II   YAOUNDE, 8370 CAMEROON   francie_okah@hotmail.fr   https://orcid.org/0000-0001-7396-3535           JEL Areas: F4 : Macroeconomic Aspects of International Trade and Finance: General E5 : Monetary Policy, Central Banking, and the Supply of Money and Credit: General