Ariane Szafarz Université Libre de Bruxelles, Solvay Business School, Centre Emile Bernheim   ULB- CEB CP145/1 50, Av. F.D. Roosevelt BRUSSELS, 1050 BELGIUM   aszafarz@ulb.ac.be   http://http://www.solvay.edu/EN/Research/Bernheim/RsUnits_General.php?user=408           JEL Areas: O1 : Economic Development: General