The high-tech sector is concentrated in a small number of cities. The ten largest clusters in computer science, semiconductors, and biology account for 69 percent, 77 percent, and 59 percent of all US inventors, respectively. Using longitudinal data on 109,846 inventors, I find that geographical agglomeration results in significant productivity gains. When an inventor moves to a city with a large cluster of inventors in the same field, she experiences a sizable increase in the number and quality of patents produced. The presence of significant productivity externalities implies that the agglomeration of inventors generates large gains in the aggregate amount of innovation produced in the United States. (JEL D62, J24, L60, O31, 034, R32)

中文翻译：

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高科技集群对顶尖发明家生产力的影响

高科技产业集中在少数城市。计算机科学、半导体和生物学领域的十大集群分别占美国所有发明人的 69%、77% 和 59%。使用 109,846 名发明人的纵向数据，我发现地理集聚导致生产力显着提高。当一位发明家搬到一个拥有大量同一领域发明家的城市时，她的专利数量和质量都会大幅增加。显着的生产力外部性的存在意味着发明者的聚集在美国产生的创新总量中产生了巨大的收益。(JEL D62, J24, L60, O31, 034, R32)