To explore whether schools' causal impacts on test-scores measure their overall impact on students, we exploit quasi-random school assignments and data from Trinidad and Tobago to estimate the causal impacts of individual schools on several outcomes. Schools' impacts on high-stakes tests are...

Existing studies on single-sex schooling suffer from biases because students who attend single-sex schools differ in unmeasured ways from those who do not. In Trinidad and Tobago students are assigned to secondary schools based on an algorithm allowing one to address self-selection bias and...

We assess the extent to which a country's external capital structure can aid in mitigating the macroeconomic impact of oil price shocks. We study two Caribbean economies highly vulnerable to oil price shocks, an oil-importer (Jamaica) and an oil-exporter (Trinidad and Tobago). From a...

In Trinidad and Tobago students are assigned to secondary schools after fifth grade based on achievement tests, leading to large differences in the school environments to which students of differing initial levels of achievement are exposed. Using both a regression discontinuity design and...

Using exogenous secondary school assignments to remove self-selection bias to schools and peers within schools, I credibly estimate both (1) the effect of attending schools with higher-achieving peers, and (2) the direct effect of short-run peer quality improvements within schools, on the same...

We study the effects of immigration on the diversity of consumption choices. Data from California in the 1990s indicate that immigration is associated with fewer stand-alone retail stores, and a greater number of large and in particular big-box retailers - evidence that likely contradicts a...

This paper addresses a longstanding puzzle involving the unbundling of services that has occurred over more than two decades in the U.S. advertising agency industry: How can the shift from the bundling to the unbundling of services be explained and what accounts for the slow pace of change?...

Multiproduct firms and product turnover are widespread phenomena. This paper develops a theoretical framework that links advantages in Ramp;D and variable costs with firm's ability to expand its portfolio of products. The framework is then applied to explain systematic differences in product...

Diversified firms have different values than comparable portfolios of single-segment firms. These value differences must be due to differences in either future cash flows or future returns. Expected security returns on diversified firms vary systematically with relative value. Discount firms...