We show that grading standards for primary school exams in England have triggered an inflation of quality indicators in the national performance tables for almost two decades. The cumulative effects have resulted in significant differences in the quality signaled to parents for otherwise...

We assigned two cohorts of kindergarten students, totaling more than 24,000 children, to teachers within schools with a rule that is as-good-as-random. We collected data on children at the beginning of the school year, and applied 12 tests of math, language and executive function (EF) at the end...

Low salaries, a limited amount of full-time teaching positions, and alternative systems of allocating teaching hours lead teachers to look for additional jobs in other schools. Although this is a more common phenomenon of teacher labor markets in developing countries, teachers who teach specific...