Duc khuong Nguyen ISC Paris School of Management, France   ,   dnguyen@iscparis.com     Biographical Sketch: Dr Nguyen is a Professor of Finance and Head of the Department of Finance and Information Systems at ISC Paris School of Management. He is also Associate Researcher at the Centre d'Economie de la Sorbonne, University Paris 1 Panthéon-Sorbonne.       JEL Areas: G0 : Financial Economics: General Q4 : Energy: General