Aymen Ben Rejeb Higher Institute of Management of Sousse, University of Sousse, Tunisia   4000 Sousse-Tunisie 4000 Sousse-Tunisie Sousse, Sousse 4000 TUNISIA   benredjeb_aymen@yahoo.fr     Biographical Sketch: Aymen Ben Rejeb is an assistant professor in Finance at the Faculty of Economics and Management of Mahdia, University of Monastir, Tunisia. He is member of the Laboratory of Management of Innovation and Sustainable Development (LAMIDED), University of Sousse, Tunisia . His area of research includes emerging markets finance, volatility and risk management in international stock markets. The research for his PhD deals with the impact of financial liberalization and crises on emerging stock markets.       JEL Areas: G0 : Financial Economics: General G1 : General Financial Markets: General (includes Measurement and Data)