Seydi ababacar Dieng Economic and Monetary Research Laboratory (LAREM)-UCAD   Dakar-Liberté,   sadieng@larem-ucad.org   https://www.larem-ucad.org/           JEL Areas: C4 : Econometric and Statistical Methods: Special Topics E3 : Prices, Business Fluctuations, and Cycles: General (includes Measurement and Data)