The effects of supply shocks in the market for apprenticeships: evidence from a German high school reform / Samuel Muehlemann (LMU Munich and IZA), Gerard Pfann (Maastricht University and IZA), Harald Pfeifer (BIBB and ROA Maastricht), Hans Dietrich (IAB Nuremberg) ; IZA Institute of Labor Economics. Bonn, Germany : IZA Institute of Labor Economics, January 2018