Differences in teacher quality are commonly cited as a key determinant of the huge international student performance gaps. However, convincing evidence on this relationship is still lacking, in part because it is unclear how to measure teacher quality consistently across countries. We use unique international assessment data to investigate the…

In Germany, students are streamed at age ten into an academic or nonacademic track. We demonstrate that the randomly allocated disadvantage of being born just before as opposed to just after the cutoff date for school entry leads to substantially different schooling experiences. Relatively young students are initially only two-thirds as likely to…