First Author:   Ariane Szafarz Université Libre de Bruxelles, Solvay Business School, Centre Emile Bernheim aszafarz@ulb.ac.be   ULB- CEB CP145/1, 50, Av. F.D. Roosevelt BRUSSELS, 1050, BELGIUM   +32.2.650.48.65(Phone) +32.2.650.48.65(Fax) http://http://www.solvay.edu/EN/Research/Bernheim/RsUnits_General.php?user=408