1. Department of Mathematics and Econometrics, Università Cattolica del Sacro Cuore, via Necchi 9, Milano, (Italy)
2. Department of Economics and Law, Università dell’Insubria, Como, (Italy)
3. Department of Mathematics and Econometrics, Università Cattolica del Sacro Cuore, Milano, (Italy)
4. Bank of Italy, Economic Research Unit – Milan Branch