There is a well-known debate about the roles of geography versus institutions in explaining the long-term development of countries. These debates have usually been based on cross-country regressions where questions about parameter heterogeneity, unobserved heterogeneity, and endogeneity cannot...

In the late 1990s the South African Department of Education implemented two policies that were meant to reduce the large number of over-age learners in the school system: schools were no longer allowed to accept students who were more than two years older than the correct grade-age and students...