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The Granular Origins of Agglomeration

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  • KIKUCHI Shinnosuke
  • Daniel G. O'CONNOR

Abstract

A few large firms dominate many local labor markets. This leaves workers vulnerable to firm-specific shocks. If one firm has a bad productivity shock in a small market, workers will be stuck with that unproductive employer, while in a large labor market, workers can move to another firm. Building on that insight, we present a model of local labor markets with a finite number of firms subject to idiosyncratic shocks. We show that there are increasing returns to scale which disappear as the number of firms goes to infinity. We also show that there can be under-entry of firms, especially in small markets. We then test the main mechanism in Japanese administrative data. We first confirm that payroll is less volatile in larger, less concentrated local labor markets. We also show that establishments with larger payroll shares respond less in adjusting employment to a demand shock. Finally, we propose a quantitative, granular model of economic geography with free entry of firms and costly mobility of workers across sectors and commuting zones that could be used to quantify our mechanisms and do counterfactuals.

Suggested Citation

  • KIKUCHI Shinnosuke & Daniel G. O'CONNOR, 2024. "The Granular Origins of Agglomeration," Discussion papers 24005, Research Institute of Economy, Trade and Industry (RIETI).
  • Handle: RePEc:eti:dpaper:24005
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