students' lifetime income by more than $250,000 for the average class- room in our sample. We conclude that good teachers …Are teachers' impacts on students' test scores ("value-added") a good measure of their quality? This question has …' impacts on student achievement and (2) whether high-VA teachers improve students' long-term outcomes. We address these two …

-experimental design based on changes in teaching staff. Using school district and tax records for more than one million children, we find …

improve students' long-term outcomes. Using school district and tax records for more than one million children, we find that … the present value of students' lifetime income by approximately $250,000 per classroom …Are teachers' impacts on students' test scores ("value-added") a good measure of their quality? This question has …

,000 per charter school enrollee. We further show that competition drives the aggregate gains; test score impacts on students …

Teacher value-added (VA) measures how teachers improve their students' contemporaneous test scores. Many teachers …, however, argue that contemporaneous test scores are a poor proxy for their permanent influence on students. This paper … test scores with subsequent test scores in VA estimation. We find that students assigned to high long-run VA teachers fare …