Thierry Betti Strasbourg University / Bureau d'Economie Théorique et Appliquée   7 Rue de la Rheinmatt Strasbourg, 67100 France   tbetti@unistra.fr             JEL Areas: E6 : Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General E3 : Prices, Business Fluctuations, and Cycles: General (includes Measurement and Data)