1. Department of Earth, Environmental and Resource Sciences, University of Naples Federico II, Naples, Italy
2. Department of Economics and Finance, University of Rome Tor Vergata, Rome, Italy
3. Department of Economics, University of Rome Niccolò Cusano, Rome, Italy
4. Department of Economic and Legal Studies, University of Naples Parthenope, Naples, Italy
5. CESifo, Area Macro, Money and International Finance, Munich, Germany