Does class size matter for school tracking outcomes after elementary school? : quasi-experimental evidence using administrative panel data from Germany / Bethlehem A. Argaw (Leibniz Universität Hannover), Patrick A. Puhani (Leibniz Universität Hannover, CReAM, University College London, SEW, University of St. Gallen, and IZA) ; IZA Institute of Labor Economics. Bonn, Germany : IZA Institute of Labor Economics, December 2017