Industry agglomeration can be indicative of agglomeration forces and is correlated with firm outcomes. Because multi-plant firms tend cluster their establishments in space, industry agglomeration could in part be driven by forces internal to the firm rather than across-firm spillovers. We propose and implement a decomposition of the industry agglomeration measures into within and across-firm components using U.S. census microdata. The within-firm component makes a small contribution to observed industry agglomeration for most industries and spatial scales, but accounts for 20% or more of observed agglomeration at short spatial scales for a subset of industries.

中文翻译：

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爵洞察：企业与产业集聚

产业集聚可以表示集聚力量，并与企业结果相关。由于多工厂企业倾向于在空间中聚集他们的机构，行业集聚可能部分是由企业内部的力量而不是跨企业溢出驱动的。我们建议并使用美国人口普查微观数据将行业集聚措施分解为公司内部和公司间的组成部分。对于大多数行业和空间尺度，企业内部成分对观察到的产业集聚贡献很小，但在部分产业的短空间尺度上占观察到的集聚的 20% 或更多。