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Jel Classification:R12 

Working Paper
Localized Knowledge Spillovers: Evidence from the Spatial Clustering of R&D Labs and Patent Citations

SUPERCEDES EORKING PAPER 17-32 Buzard et al. (2017) show that American R&D labs are highly spatially concentrated even within a given metropolitan area. We argue that the geography of their clusters is better suited for studying knowledge spillovers than are states, metropolitan areas, or other political or administrative boundaries that have predominantly been used in previous studies. In this paper, we assign patents and citations to these newly defined clusters of R&D labs. Our tests show that the localization of knowledge spillovers, as measured via patent citations, is strongest at small ...
Working Papers , Paper 19-42

Working Paper
The Paper Trail of Knowledge Spillovers: Evidence from Patent Interferences [REVISED]

REVISED 9/2019: We show evidence of localized knowledge spillovers using a new database of multiple invention from U.S. patent interferences terminated between 1998 and 2014. Patent interferences resulted when two or more independent parties simultaneously submitted identical claims of invention to the U.S. Patent Office. Following the idea that inventors of identical inventions share common knowledge inputs, interferences provide a new method for measuring spillovers of tacit knowledge compared with existing (and noisy) measures such as citation links. Using matched pairs of inventors to ...
Working Papers , Paper 17-44

Working Paper
The role of two frictions in geographic price dispersion: when market friction meets nominal rigidity

This paper empirically investigates and theoretically derives the implications of two frictions, market friction and nominal rigidity, on the dynamic properties of intra-national relative prices, with an emphasis on the interaction of the two frictions. By analyzing a panel of retail prices of 45 products for 48 cities in the U.S., we make two major arguments. First, the effect of each type of friction on the dynamics of intercity price gaps is quite different. While market frictions arising from physical distance and transportation costs contribute significantly to volatile and persistent ...
Globalization Institute Working Papers , Paper 219

Working Paper
Productivity, congested commuting, and metro size

The monocentric city model is generalized to a fully structural form with leisure in utility, congested commuting, and the equalizing of utility and perimeter land price across metros. Exogenous and agglomerative differences in total factor productivity (TFP) drive differences in metro population, radius, land use, commute time, and home prices. Quantitative results approximate observed correspondences among these outcomes across U.S. metros. Traffic congestion proves the critical force constraining population. Self-driving cars significantly increase the sensitivity of metro population to ...
Research Working Paper , Paper RWP 16-3

Working Paper
The Return to Big City Experience: Evidence from Danish Refugees

We offer causal evidence of higher returns to experience in big cities. Exploiting a natural experiment that settled political refugees across labor markets in Denmark between 1986 and 1998, we find that while refugees initially earn similar wages across locations, those placed in Copenhagen exhibit 35% faster wage growth with each additional year of experience. This gap is driven primarily by differential sorting towards high-wage establishments, occupations, and industries. An estimated spatial model of earnings dynamics attributes an important role to unobserved worker ability: more able ...
Opportunity and Inclusive Growth Institute Working Papers , Paper 24

Journal Article
A Regional Look at U.S. International Trade

Economic activity at the state level varies greatly across U.S. regions, with different states specializing in the production of particular goods and services. This heterogeneity in activity informs the geographic distribution of U.S. imports and exports. Using U.S. Census Bureau foreign trade statistics, the authors examine the distribution of U.S. international trade at the state level, controlling for commodities and major trading partners. They find that trade activity varies greatly from state to state and identify two factors affecting this pattern?proximity to a trading partner and ...
Review , Volume 98 , Issue 1 , Pages 17-39

Working Paper
The Agglomeration of American Research and Development Labs

We employ a unique data set to examine the spatial clustering of about 1,700 private research and development (R&D) labs in California and across the Northeast corridor of the United States. Using these data, which contain the R&D labs? complete addresses, we are able to more precisely locate innovative activity than with patent data, which only contain zip codes for inventors? residential addresses. We avoid the problems of scale and borders associated with using fixed spatial boundaries, such as zip codes, by developing a new point pattern procedure. Our multiscale core-cluster approach ...
Working Papers , Paper 17-18

Working Paper
How Much Should We Trust Regional-Exposure Designs?

Many prominent studies in macroeconomics, labor, and trade use panel data on regions to identify the local effects of aggregate shocks. These studies construct regional-exposure instruments as an observed aggregate shock times an observed regional exposure to that shock. We argue that the most economically plausible source of identification in these settings is uncorrelatedness of observed and unobserved aggregate shocks. Even when the regression estimator is consistent, we show that inference is complicated by cross-regional residual correlations induced by unobserved aggregate shocks. We ...
Working Papers , Paper 2023-018

Working Paper
Saving the American Dream? Education Policies in Spatial General Equilibrium

Children's education and economic opportunities differ substantially across US neighborhoods. This paper develops and estimates a spatial equilibrium model that links children's education outcomes to their childhood location. Two endogenous factors determine education choices in each location: local education quality and local labor market access. We estimate the model with US county-level data and study the effects of a school funding equalization on education outcomes and social mobility. The reform's direct effects improve education outcomes among children from low-skill families. However, ...
Opportunity and Inclusive Growth Institute Working Papers , Paper 47

Working Paper
The Geography of Business Dynamism and Skill Biased Technical Change

This paper seeks to explain several key components of the growing regional disparities in the U.S. since 1980: big cities saw a larger increase in the relative wages and relative supply of skilled workers, and a smaller decline in business dynamism. These trends can be explained by differences across cities in the extent to which firms adopt new skill-biased technologies. With the introduction of a new skill-biased, high fixed cost but low marginal cost technology, firms endogenously adopt more in big cities, cities that offer abundant amenities for high-skilled workers and cities that ...
Working Papers , Paper 2020-020

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