1. Department of Education and Psychology, Freie Universität Berlin, Germany
2. Economics Department, Leeds University Business School, University of Leeds, UK
3. Department of Economics, School of Business & Economics, Freie Universität Berlin, Germany
4. CESifo, Munich, Germany
5. Institute for Employment Research (IAB), Nürnberg, Germany
6. School of Business, Economics and Society, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany