1. Department of Economics, Statistics and Finance “Giovanni Anania”, University of Calabria, Arcavacata, Italy
2. Department of Economics and Statistics, University of Salerno, Fisciano, Italy
3. Bank of Italy, Trieste Branch, Economic Research Unit, Trieste, Italy
4. Department of Economics, University of Graz, Graz, Austria
5. Department of Economics, Business, Mathematics and Statistics, University of Trieste, Trieste, Italy