THE RELATIONSHIP BETWEEN LEADER/FOLLOWER CONGRUENCE AND FOLLOWER COMMITMENT There are three plausible explanations for the pattern of findings presented here. First, it may be that school and district policies are not responsible for a large share of the extant across-school variation in student performance. We would not then expect to observe effectiveness sorting, regardless of its extent, in the distribution of student SAT scores. Second, the number of school districts may not capture variation in parents ability to exercise Tiebout choice
