1. Department of Economics, Alma Mater Studiorum–Università di Bologna, 40126 Bologna, Italy;
2. Department of Decision Sciences, University of Bocconi, 20100 Milan, Italy;
3. Innocenzo Gasparini Institute for Economic Research, University of Bocconi, 20100 Milan, Italy;
4. Bocconi Institute for Data Science and Analytics, University of Bocconi, 20100 Milan, Italy;
5. Department of Computer Science, University College London, London WC1E 6BT, United Kingdom;
6. MTA Társadalomtudományi Kutatóközpont “Lendület” Research Center for Educational and Network Studies, Hungarian Academy of Sciences, 1051 Budapest, Hungary