In this paper we develop a new approach to measuring the gains from economic integration based on a generalization of the Ricardian model in which heterogeneous factors of production are allocated to multiple sectors in multiple local markets based on comparative advantage. We implement this...

Despite the recent inroads made by models of interregional trade based on external" economies, the analysis of the long-run trends in U.S. regional specialization in agriculture manufacturing, wholesale trade, retail trade, services, and all economic activities indicate that" these trends are...

Assessing the impact of lead exposure is difficult if individuals select on the basis of their characteristics into environments with different exposure levels. We address this issue with data from when the dangers of lead exposure were still largely unknown, using new evidence on intelligence...

We study the relationship between Hispanic employment and location-specific measures of the distribution of jobs. We find that it is only the local density of jobs held by Hispanics that matters for Hispanic employment, that measures of local job density defined for Hispanic poor English...

Intergenerational income mobility is lower in the United States than in Canada, but varies significantly within each country. Our sub-national analysis finds that the national border only partially distinguishes the close to one thousand regions we analyze within these two countries. The...

Chay, Guryan and Mazumder (2009) found substantial racial convergence in AFQT and NAEP scores across cohorts born in the 1960's and early 1970's that was concentrated among blacks in the South. We demonstrated a close tracking between variation in the test score convergence across states and...

Population ecology models are elegant in form and adequate in describing aggregate data, but poor in telling stories and predicting the location of growth. Fundamentals models emphasizing the variables central to resource mobilization, such as intellectual human capital, can predict where and...

Is private industry investing in backbone digital technology in a manner consistent with social policy? To address this question we assemble highly disaggregate data and compute indices for the geographic distribution of advanced backbone information technology in computing and...

The severity of the Great Depression in the United States varied by region. Most notably compared with the rest of the country, the South Atlantic states experienced a milder contraction while the Mountain states suffered more severely. The impact of the contraction was more" uniform across...