It is costly for firms' offers to workers to be turned down both because firms must make additional offers and making offers is costly, and because capital is underused or unused. Provided that workers apply to at least two firms for jobs, there will be wage dispersion in equilibrium and some...

The twelfth century rabbinic scholar Maimonides proposed a maximum class size of 40. This same maximum induces a nonlinear and nonmonotonic relationship between grade enrollment and class size in Israeli public schools today. Maimonides' rule of 40 is used here to construct instrumental...

We use student assignment lotteries to estimate the effect of charter school attendance on student achievement in Boston. We also evaluate a related alternative, Boston's pilot schools. Pilot schools have some of the independence of charter schools but are in the Boston Public School district...