The Effect of High-Tech Clusters on the Productivity of Top Inventors

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.

Automated summary

The high-tech sector is concentrated in a small number of cities, which leads to productivity gains through geographical agglomeration. When inventors move to cities with large clusters of peers, they produce more high-quality patents.