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Working Paper
Technology and industrial agglomeration: evidence from computer usage
Although the association between industrial agglomeration and productivity has been widely examined and documented, little work has explored the possibility that these `external' productivity shifts are the product of more advanced technologies. This paper offers a look at this hypothesis using data on individual-level computer usage across a sample of U.S. metropolitan areas over the years 1984, 1989, 1993, and 1997. The results indicate that, for a wide array of industries at the two-, three-, and four-digit SIC level, an industry's scale within a metropolitan area is positively associated ...
Working Paper
Do localization economies derive from human capital externalities?
One of the most robust findings emerging from studies of industrial agglomeration is the rise in productivity that tends to accompany it. What most studies have not addressed, however, is the potential role played by human capital externalities in driving this relationship. This paper seeks to do so using data from the 1980, 1990, and 2000 US Census covering a collection of 77 (primarily) 3-digit manufacturing industries across a sample of more than 200 metropolitan areas. The analysis generates two primary results. First, a variety of education- and experience-based measures of average human ...
Working Paper
Worker turnover, industry localization, and producer size
Empirically, large employers have been shown to devote greater resources to filling vacancies than small employers. Following this evidence, this paper offers a theory of producer size based on labor market search, whereby a key factor in the determination of producer's total employment is the ease with which workers can be found to fill jobs that are, periodically, vacated. Since the geographic localization of industry has long been conjectured to facilitate the search process, the model provides an explanation for the observed positive association between average producer size and the ...
Journal Article
Urban decentralization and income inequality: is sprawl associated with rising income segregation across neighborhoods?
Existing research shows an inverse relationship between urban density and the degree of income inequality within metropolitan areas; this information suggests that as urban areas spread out, they become increasingly segregated by income. This paper examines this hypothesis using data covering more than 165,000 block groups within 359 U.S. metropolitan areas for the years 1980, 1990, and 2000. The findings indicate that income inequality-defined by the variance of the log household income distribution-does indeed rise significantly as urban density declines. This increase, however, is ...
Working Paper
Neighborhood income inequality
This paper offers a descriptive empirical analysis of the geographic pattern of income inequality within a sample of 359 US metropolitan areas between 1980 and 2000. Specifically, we decompose the variance of metropolitan area-level household income into two parts: one associated with the degree of variation among household incomes within neighborhoods - defined by block groups and tracts - and the other associated with the extent of variation among households in different neighborhoods. Consistent with previous work, the results reveal that the vast majority of a city?s overall income ...
Working Paper
Cities and the growth of wages among young workers: evidence from the NLSY
Human capital-based theories of cities suggest that large, economically diverse urban agglomerations increase worker productivity by increasing the rate at which individuals acquire skills. One largely unexplored implication of this theory is that workers in big cities should see faster growth in their earnings over time than comparable workers in smaller markets. This paper examines this implication using data on a sample of young male workers drawn from the National Longitudinal Survey of Youth 1979 Cohort. The results suggest that earnings growth does tend to be faster in large, ...
Journal Article
Trends in neighborhood-level unemployment in the United States: 1980 to 2000
Although the average rate of unemployment across U.S. metropolitan areas declined between 1980 and 2000, the geographic concentration of the unemployed rose sharply over this period. That is, residential neighborhoods throughout the nation's metropolitan areas became increasingly divided into high- and low-unemployment areas. This paper documents this trend using data on more than 165,000 U.S. Census block groups (neighborhoods) in 361 metropolitan areas over the years 1980, 1990, and 2000; it also examines three potential explanations: (i) urban decentralization, (ii) industrial shifts and ...
Working Paper
Local market scale and the pattern of job changes among young men
In finding a career, workers tend to make numerous job changes, with the majority of 'complex' changes (i.e. those involving changes of industry) occurring relatively early in their working lives. This pattern suggests that workers tend to experiment with different types of work before settling on the one they like best. Of course, since the extent of economic diversity differs substantially across local labor markets in the U.S. (e.g. counties and cities), this career search process may exhibit important differences depending on the size of a worker?s local market. This paper explores this ...
Journal Article
Neighborhoods that don't work
Unemployment is becoming more concentrated. Neighborhoods that had high unemployment in 1980 had even higher unemployment 20 years later. What are the possible reasons-and solutions-for this trend?
Working Paper
Job flows and productivity dynamics: evidence from U.S. manufacturing
Through their influence on the cross-sectional distribution of productivity across firms and workers, job creation and destruction likely have an impact on the rate at which aggregate productivity changes over time. However, the nature of this effect is not, a priori, clear. While a broad consensus has emerged suggesting that job destruction enhances productivity by eliminating inefficient production units, theories disagree with regard to the effect of job creation. In particular, 'vintage-capital' theories of creative destruction suggest a positive influence since job flows are conjectured ...