Peer effects are potentially important for understanding the optimal organization of schools, jobs, and neighborhoods, but finding evidence is difficult because people are selected into peer groups based, in part, on their unobservable characteristics. I identify the effects of peers whom a...

Many school choice proposals would enable parents to choose among public school districts in their area, though not among private schools. Theory predicts three reactions to easier choice among public schools: increased sorting of students and parents among schools; easier choice will encourage...

This paper examines the validity of overidentification tests and exogeneity tests in the presence of grouped data. We find that even a small intra-group correlation, when instruments do not vary within groups, may generate a substantial bias in the standard overidentification tests described in...

We investigate how university governance affects research output, measured by patenting and international university research rankings. For both European and U.S. universities, we generate several measures of autonomy, governance, and competition for research funding. We show that university...

Arguments in favor of school choice depend on the idea that competition between schools improves the quality of education. However, we have almost no empirical evidence on whether competition actually affects school quality. In this study, I examine the effects of inter-school competition on...

Rothstein has produced two comments, Rothstein (2003) and Rothstein (2004), on Hoxby "Does Competition Among Public Schools Benefit Students and Taxpayers," American Economic Review, 2000. In this paper, I discuss every claim of any importance in the comments. I show that every claim is wrong. I...

The incomes and wages of college-educated Americans have become significantly more dispersed since 1970. This paper attempts to decompose this growing dispersion into three possible sources of growth. The first source, or extensive margin,' is the increasing demographic diversity of people who...

This paper evaluates the first year of Harvard's Financial Aid Initiative, which increased aid and recruiting for students from low income backgrounds. Using rich data from the Census and administrative sources, we estimate family incomes for the vast major of plausible applicants from the U.S....

New empirical work shows the degree of competition among public providers of local public goods or between public and private providers of local public goods matters. This evidence needs a theory of the local public goods producer. Tiebout's hypothesis spawned a literature that gives local...

A school that is more productive is one that produces higher achievement in its pupils for each dollar it spends. In this paper, I comprehensively review how school choice might affect productivity. I begin by describing the importance of school productivity, then explain the economic logic that...