1. ICRIOS, Bocconi University, Via G. Roentgen, 1, Milan 20136, Italy. e-mail: nicoletta.corrocher@unibocconi.it
2. Institute of Economics, Sant’Anna School of Advanced Studies , Piazza Martiri della Libertà 33, Pisa 56100, Italy . e-mail: daniele.moschella@santannapisa.it ; e-mail: jacopo.staccioli@unicatt.it
3. Department of Economic Policy, Catholic University of the Sacred Heart , Largo Fra Agostino Gemelli, 1, Milan 20123, Italy . e-mail: jacopo.staccioli@unicatt.it ; e-mail: marco.vivarelli@unicatt.it
4. Maastricht Economic and Social Research Institute on Innovation and Technology, UNU-MERIT , Boschstraat 24, Maastricht 6211 AX, The Netherlands . e-mail: marco.vivarelli@unicatt.it
5. Forschungsinstitut zur Zukunft der Arbeit GmbH (IZA) , Schaumburg-Lippe-Strasse 5-9, Bonn 53113, Germany . e-mail: marco.vivarelli@unicatt.it