This paper investigates whether the geographic distribution of manufacturing activities depends on the size of plants. Using Italian data, we find, as in Kim [Kim, S., 1995. Expansion of markets and the geographic concentration of economic activities: the trends in U.S. regional manufacturing structure, 1860-1987, Quarterly Journal of Economics 110 (4), 881-908.], Holmes and Stevens [Holmes, T.J., and Stevens, J.J., 2002. Geographic concentration and establishment scale, Review of Economics and Statistics 84, 682-690.], and Holmes and Stevens [Holmes, T.J. and Stevens, J.J., 2004. Spatial distribution of economic activities in North America, in: J.V. Henderson and J.F. Thisse, eds., Handbook of Regional and Urban Economics, Vol.4, (Elsevier-North Holland, Amsterdam).], that large plants are more concentrated than small plants. However, considering distance-based patterns via spatial auto-correlation, we find that small establishments actually exhibit a greater tendency to be located in adjacent areas. These apparently contradictory findings raise a measurement issue regarding co-location externalities and suggest that large plants are more likely to cluster within narrow geographical units (concentration), while small establishments would rather co-locate within wider distance-based clusters (agglomeration). This picture is consistent with different size plants engaging in different transport-intensive activities.
This paper providesempirical support to the intuitive statement that urban geography matters to the success or failure of place-based public policies, using the French enterprise zone program as a case study. According to the few existing evaluations, this program has only had a small positive average impact on firm and job creation rates. In addition, this impact was shown to be strongly heterogeneous across the treated neighborhoods may account for part of these results. We estimate a series of augmented difference-in-differences models in which we interact the treatment indicator with a series of original indicators of spatial isolation, wich account for severance, peripherality and disconnection to transportation networks within the urban area. Results indicate that isolation does matter to explain spatial differentials in job creation and firm settlement rates across enterprise zones: only accessible neighborhoods were able to draw benefits from tax breaks and social exemptions. moreover, whereas the program mostly worked through a displacement effect on pre-existing firms, we show that urban geography was a clear determinant of the decision to create new firms from scratch.
