Anne-gaël Vaubourg CRIEF - University of Poitiers   UFR Sciences économiques 2, Rue Jean Carbonnier Bât A1 anne-gael.vaubourg@u-bordeaux.fr POITIERS Cedex 9, 86073 France   anne.gael.vaubourg@univ-poitiers.fr             JEL Areas: G1 : General Financial Markets: General (includes Measurement and Data) L1 : Market Structure, Firm Strategy, and Market Performance: General