Idrys fransmel Okombi Marien Ngouabi University   BP 69, Marien Ngouabi University (FSE) Brazzaville, Republic of Congo   idrysfransmel@gmail.com             JEL Areas: E5 : Monetary Policy, Central Banking, and the Supply of Money and Credit: General E3 : Prices, Business Fluctuations, and Cycles: General (includes Measurement and Data)