David Bourghelle is Associate Professor at the University of Lille (IAE), holding a PhD in finance and an accreditation to direct research (HDR) from the University of Lille.Roland Pérez has a PhD in Economics (University Paris1) and the French national concourse of University Professor in Economics and Management Science.Philippe Rozin is an Associate Professor at the University of Lille. He holds a PhD in finance from the University of Paris-Nanterre and a PhD in Philosophy from the University of Paris IV -Sorbonne.