I use natural population variation to identify the effects of class size and composition on student achievement. I isolate the credibly random component of population variation in each grade and school district and use this component to generate instrumental variables for class size and...

This paper shows that although the top ten percent of colleges are substantially more selective now than they were 5 decades ago, most colleges are not more selective. Moreover, at least 50 percent of colleges are substantially less selective now than they were then. This paper demonstrates that...

Discussions of school accountability focus on two issues: poor test administration and the expense of accountability. Up to this point, researchers have focused on test quality and simply assumed that the programs are expensive enough to crowd out other policies, such as class size reduction or...

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...

I consider how online postsecondary education, including massive open online courses (MOOCs), might fit into economically sustainable models of postsecondary education. I contrast nonselective postsecondary education (NSPE)in which institutions sell fairly standardized educational services in...

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...

The Department of Justice's (DOJ's) investigation of private colleges for price-fixing caused the Overlap' group of colleges to discontinue their meetings. DOJ alleged that the meetings enabled the colleges to collude on higher tuition and increase their tuition revenue. The colleges claimed...

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...

Every year, thousands of high school seniors with high college aptitude face complicated menus' of scholarship and aid packages designed to affect their college choices. Using an original survey designed for this paper, we investigate whether students respond to their menus' like rational human...

In identifying whether universities provide opportunities for low-income students, there is a measurement challenge: different institutions face students with different incomes and preparation. We show how a hypothetical university's "relevant pool"-the students from whom it could plausibly...