Karine Constant AMSE GREQAM Aix-Marseille University   Centre de la Vieille Charité 2 rue de la charité Marseille, 13236 FRANCE   constant.karine@gmail.com   http://karine-constant.fr/           JEL Areas: Q5 : Environmental Economics: General E2 : Macroeconomics: Consumption, Saving, Production, Employment, and Investment: General (includes Measurement and Data)