@book{ 0-1678554707, title = {Academic achievement and tracking: a theory based on grading standards}, series = {CESifo working paper Category 5, Economics of education}, author = {Ehlers, Tim and Schwager, Robert}, address = {Munich, Germany}, publisher = {CESifo, Center for Economic Studies & Ifo Institute}, year = {2019}, language = {English}, url = {https://www.cesifo.org/en/publikationen/2019/working-paper/academic-achievement-and-tracking-theory-based-grading-standards}, url = {https://katalog.ub.tu-freiberg.de/Record/0-1678554707} }