1. Erasmus University Rotterdam, Tinbergen Institute, 3062 PA Rotterdam, Netherlands
2. CESifo Munich, 81679 Munich, Germany
3. Institute of Labor Economics (IZA), 53113 Bonn, Germany
4. University of Stavanger Business School, 4036 Stavanger, Norway
5. Humboldt-Universität zu Berlin, Faculty of Economics and Business Administration, 10099 Berlin, Germany
6. Center for Economic Policy Research (CEPR), London EC1V 0DX, United Kingdom