We show that in school systems with grade retention or redshirting, birth cohort size is negatively related to the grade-level share of students who are too old for their grade. This compositional effect gives rise to an upward bias in estimates of class size effects based on commonly used...

This paper studies responses to high-stakes incentives arising from early ability tracking. We use three complementary research designs exploiting differences in school track admission rules at the end of primary school in Germany's early ability tracking system. Our results show that the need...

Most school systems grant teachers and school principals considerable discretion in grade retention decisions. This paper argues that schools can exploit this discretion by selectively retaining students to reduce class size which potentially has important implications for public spending on...

Academic careers in Germany have been under debate for a while. We conduct a survey among postdocs in Germany, to analyze the perceptions and attitudes of postdocs regarding their research incentives, their working conditions, and their career prospects. We conceptualize the career prospects of...

Academic careers in Germany have been under debate for a while. We conduct a survey among postdocs in Germany, to analyze the perceptions and attitudes of postdocs regarding their research incentives, their working conditions, and their career prospects. We conceptualize the career prospects of...

In this paper, we estimate the effect of pupil?s relative age within the first grade of primary school on math and reading test scores at age 15. The main objective is to evaluate the long-term causal effect of relative age in the first grades of primary school on pupil?s test in 16 different...