1. Directorate General for Economics, Statistics and Research, Bank of Italy, 00184 Rome, Italy;
2. Libera Università Internazionale degli Studi Sociali (LUISS) Guido Carli, 00197 Rome, Italy;
3. Centre for Economic Policy Research (CEPR), London EC1V 0DX, United Kingdom;
4. Einaudi Institute for Economics and Finance (EIEF), 00187 Rome, Italy