1. Banque de France, 31 rue Croix des Petits Champs 75001, Paris, France.
2. European Central Bank, Kaiserstrasse 29 60318 Frankfurt am Main, Germany.
3. Department of Economics, Boston College, Federal Reserve Bank of Boston, and National Bureau of Economic Research (NBER), 140 Commonwealth Avenue, Chestnut Hill, MA 02467-3859.
4. Organisation for Economic Co-operation and Development (OECD), 2 Rue André Pascal, 75775 Paris Cedex 16, Paris, France.