Marc Sangnier Aix-Marseille Univ. (Aix-Marseille School of Economics), CNRS & EHESS   48 boulevard Jourdan PARIS, 75014 FRANCE   marc.sangnier@univ-amu.fr   http://www.pse.ens.fr/junior/sangnier/           JEL Areas: P4 : Other Economic Systems: General Z1 : Cultural Economics; Economic Sociology; Economic Anthropology: General