Khadidiatou Ba CREM, University of Caen, Basse-Normandie   401 boulevard du Grand Parc Appart 1226 401 boulevard du grand parc, HEROUVILLE SAINT CLAIR, --- 14200 France   khadidiatou.ba01@unicaen.fr             JEL Areas: G1 : General Financial Markets: General (includes Measurement and Data) C1 : Econometric and Statistical Methods: General