研究的地理分布：知识生产与获取之间的权衡
The Geography of Research: The Trade-Off Between Knowledge Production and Access
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中文总结 AI 辅助
该研究针对美国研究活动与人口空间错位问题，利用文献数据分离个体与区位效应，发现自身机构集聚效应显著，提出适度将研究人员分配到研究较少的大都市可小幅提升总产出。
中文摘要 AI 辅助
研究活动会产生高度本地化的正外部性，但在美国，随着人口迁出仍锚定着主要研究机构的传统城市，研究活动与人口及经济活动的空间错位日益加剧。将研究人员重新分配到人口中心可扩大当地的知识获取范围，但如果传统机构或大型研究集群能提高研究人员的产出，这种重新分配可能会减少知识生产。因此，研究人员的空间重新分配需要在知识获取的收益与知识生产的损失之间进行权衡。为量化重新分配带来的知识生产损失，我们利用文献数据将个体效应与区位效应分离，结果显示区位效应是不同地点研究产出差异的重要原因。我们的工具变量估计提供了有力证据，证明存在自身机构的集聚效应，但外部集群效应的证据较弱。随后，我们将这些估计纳入反事实重新分配，结果表明，将研究人员适度重新分配到研究活动相对较少的大型都市地区，有可能提高总产出，因为相关的知识生产损失较小，且可被小幅的知识获取收益抵消。
英文摘要
Research activity generates highly localized positive spillovers, yet in the U.S. it has become increasingly spatially misaligned with population and economic activity as people moved away from legacy cities where major research institutions remain anchored. Reallocating researchers toward population centers could broaden local access to knowledge but may reduce knowledge production if legacy institutions or large research clusters raise researcher output. The spatial reallocation of researchers therefore entails a trade-off between gains in knowledge access and losses in knowledge production. To quantify the knowledge production loss from reallocation, we use bibliographic data to separate individual effects from location effects and show that location effects account for substantial differences in research output across locations. Our instrumental-variables estimates provide robust evidence of own-institution agglomeration effects but weaker evidence of external-cluster effects. We then incorporate these estimates into counterfactual reallocations and show that marginally reallocating researchers toward large metropolitan areas with relatively little research activity can plausibly raise aggregate output because the associated knowledge production losses are modest and can be offset by small access gains.
