Eric Hanushek of Stanford University's Hoover Institution talks with EconTalk host Russ Roberts about the importance of teacher quality in education. Hanushek argues that the standard measures of quality--experience and advanced degrees--are uncorrelated with student performance. But some teachers consistently cover dramatically more material and teach more than others, even within a school. Hanushek presents evidence that the impact of these differences on lifetime earnings for students can be quite large. The conversation closes with a discussion of school finance and the growth of administrators within school systems.