Taking the early U.S. automobile industry as an example, we evaluate two competing hypotheses on geographic concentration of industry: local externalities versus employee spinoffs. Our findings suggest that both forces contribute to industry agglomeration through their specific channels, and the spinoff effect can be viewed as a special form of local externalities. Calibrating our model to the ...

We investigate whether a more concentrated regional industrial structure—the dominance of a few large firms in a given industry in a region—limits agglomeration economies and ultimately diminishes the economic performance of firms in that industry, especially small ones. In an application to three industries using establishment-level production functions and a combination of confidential and pu...

This paper examines the importance of factor mobility within countries for the manifestation of agglomeration and location effects emphasized in the new economic geography literature. Working with a model of trade under monopolistic competition, the relationship of factor mobility (in particular labor) to industry adjustment and relocation is developed analytically, and then illustrated with a ...

In models of economic geography, plant-level scale economies and trade costs create incentives for spatial agglomeration of production into a manufacturing core and agricultural periphery, creating regional income differentials. We examine tax competition between national governments to influence the location of manufacturing activity. Labour is imperfectly mobile and governments impose redistr...

Entry into an industry often clusters in regions where the industry is already concentrated, which is suggestive of agglomeration economies. Regional public research activities may exert another attracting force on entrants into science-based industries. Empirically these proximity effects are confounded by other influences on where entrants originate and locate. This paper begins to disentangl...

The use of nanotechnology-based products is constantly increasing and there are concerns about the fate and effect on the aquatic environment of antimicrobial products such as silver nanoparticles. By combining different characterization techniques (asymmetric flow field-flow fractionation, single particle ICP-MS, UV-Vis) we show that it is possible to assess in detail the agglomeration process...

Geographic clustering of innovative industries is associated with the entry and success of spinoff firms. We develop a model to explain the multiple empirical patterns regarding cluster growth and spinoff formation and performance, without relying on agglomeration externalities. Clustering naturally follows from spinoffs locating near their parents. In our model, firms grow and spinoffs form th...

Dust growth by agglomeration due to a new mechanism of dust attraction is shown to compete in space plasmas with the standard accretion mechanism by neutral particles. We demonstrate that dust growth by accretion of neutrals and plasma particles is aided by a pressure force due to a shadowing effect first proposed (Bingham & Tsytovich 2001) to explain rapid growth of dust in laboratory discharg...

Two contrasting attributes of transportation costs are introduced in this analysis. These are categorized as internal and external to the firm or the industry. It is shown that the trade-off interaction between agglomeration economies and transportation costs in established location theory solely refers to the external nature of transportation costs to the firm. This paper reveals that there is...