Many industries are geographically concentrated. Many mechanisms that could account for such agglomeration have been proposed. We note that these theories make different predictions about which pairs of industries should be coagglomerated. We discuss the measurement of coagglomeration and use...

We collect time-use data for entrepreneurs and their workers in over 1,000 manufacturing firms in urban Uganda. We document limited labor specialization within the firm for establishments of all sizes and argue that this is likely due to the prevalence of product customization. We then develop a...

The long-standing view in US economic history is the shift in manufacturing in the nineteenth century from the artisan shop to the mechanized factory led to "labor deskilling." Craft workers were displaced by mix of semi-skilled operatives, unskilled workers, and a reduced force of mechanics to...

We model the implications of the classical ideas that larger markets allow for a finer division of labor and this division feeds back into larger market size. Market size affects specialization due to firm-level increasing returns to scale arising from fixed costs of adopting...

This paper studies localization of academic and industrial knowledge spillovers. Using data on U.S. Research and Development laboratories, that quantify spatial aspects of learning about universities and firms as well as their locations, I find that academic spillovers are more localized than...

The returns to face-to-face interactions are of central importance to understanding the determinants of agglomeration. However, the existing literature studying patterns of geographic proximity in patent citations or industrial co-location has struggled to disentangle the benefits of...

This paper discusses the prevalence of Silicon Valley-style localizations of individual manufacturing industries in the United States. Several models in which firms choose locations by throwing darts at a map are used to test whether the degree of localization is greater than would be expected...

In Japan, the manufacturing has become geographically dispersed in the 1990s, when the import share has risen after the historic exchange rate appreciation. As is consistent with the interpretation that import penetration undermines regional input-output linkages, our regressions detect the...

With some models of money and a representative-agent there is no reason for monetary trade because identical individuals can consume their own production. Lucas proposed a parable involving differentiated products in a cash-in-advance model to avoid this problem. This paper studies Lucas?s...

We study how the inventive capability of a firm conditions its participation in a division of innovative labor. Capable firms are, by definition, able to invent; for them, external inventions substitute for their own R&D. However, external knowledge is an input into internal invention, and thus,...