1 Federal Institute for Vocational Education and Training (BIBB), Division 1.3 Economics of VET, Robert-Schuman-Platz 3, 53175 Bonn, Germany, 2 Research Centre for Education and the Labour Market (ROA), Maastricht University, School of Business and Economics, Tongersestraat 49, 6211 LM Maastricht, the Netherlands, 3 IZA Institut zur Zukunft der Arbeit, Schaumburg-Lippe-Straße 5-9, 53113 Bonn, Germany, 4 UNU-Merit, United Nations University, Boschstraat 24, 6211 AX Maastricht, the Netherlands