Winner Takes All? Tech Clusters, Population Centers, and the Spatial Transformation of U.S. Invention
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Tech clusters now account for 34.2% of US patents, up from 11.3% in 1975-1979. Activity has reallocated from larger population centers.
New NBER from Kerr finds innovation has become increasingly concentrated, "U.S. invention has become increasingly concentrated around major tech centers since the 1970s, with implications for how much cities across the country share in concomitant local benefits. Is invention becoming a winner-takes-all race? We explore the rising spatial concentration of patents and identify an underlying stability in their distribution. Software patents have exploded to account for about half of patents today, and these patents are highly concentrated in tech centers. Tech centers also account for a growing share of non-software patents, but the reallocation, by contrast, is entirely from the five largest population centers in 1980.Non-software patenting is stable for most cities, with anchor tenants like universities playing important roles, suggesting the growing concentration of invention may be nearing its end. Immigrant inventors and new businesses aided in the spatial transformation…Figure 1 shows annual rates of U.S. patenting for tech clusters and large population centers. Beyond these two groups, we aggregate the remaining 270 MSAs and prepare a fourth group for rural areas. The thatched portion of each series is software-related, and the solid portion is nonsoftware-related. Patents are dated by their application years, and the final period of 2015-2019 is not shown due to incomplete series with respect to patent counts given future grants will occur. The share-based metrics that we focus on for most of this paper are less sensitive to this incomplete process. The rise of the six tech centers is very stark, and Figure 2 presents these data in terms of shares. The six tech centers account for 11.3% of patents from 1975-1979, but surge to 34.2% for 2015- 2019. San Francisco’s growth is from 4.6% to 18.4%. While other groups decline in share, the magnitudes and economic importance are different. The five largest population centers show the largest drop, from 32.2% to 18.6%. By contrast, the aggregate decline for the other 270 cities, from 45.5% to 41.0%, is much less. Non-urban areas also decline from 11.0% to 6.1%....”

Evidence, "...Figure 1 shows annual rates of U.S. patenting for tech clusters and large population centers. Beyond these two groups, we aggregate the remaining 270 MSAs and prepare a fourth group for rural areas. The thatched portion of each series is software-related, and the solid portion is non-software-related. Patents are dated by their application years, and the final period of 2015-2019 is not shown due to incomplete series with respect to patent counts given future grants will occur. The share-based metrics that we focus on for most of this paper are less sensitive to this incomplete process. The rise of the six tech centers is very stark, and Figure 2 presents these data in terms of shares. The six tech centers account for 11.3% of patents from 1975-1979, but surge to 34.2% for 2015-2019. San Francisco’s growth is from 4.6% to 18.4%.While other groups decline in share, the magnitudes and economic importance are different. The five largest population centers show the largest drop, from 32.2% to 18.6%. By contrast, the aggregate decline for the other 270 cities, from 45.5% to 41.0%, is much less. Non-urban areas also decline from 11.0% to 6.1%. This reallocation is remarkable and has not been documented in prior work…”
Software vs Non-Software Patenting, “…Figures 1 and 2 suggest that software patenting is important for our understanding of spatial clustering and tech clusters. Software patents are a significant share of invention in all cities, but they account for well more than half of patents in tech clusters. Panel B in Figure 2 shows that the tech centers account for 45.4% of software patents after 2015, more than double their starting share of 20.2%. San Francisco again features prominently with 25.8% of software patents filed after 2015. This reallocation pulled from all regions. Panel B of Figure 2 shows that tech clusters are also important for non-software patents (solid lines), growing from 11.0% to 23.1% across the period. San Francisco is 11.1%. However, the share for the 270 MSAs grows slightly from 45.5% to 48.1%. The shift is instead from the five largest cities in 1980, which fall from 32.3% to 20.0%. These cities have remained mostly prosperous and often hold leading positions in important sectors (e.g., media in Los Angeles, finance in New York). But, while patents continue to increase in a super-linear relationship to city population, invention has become less coupled to the largest cities...”
Core findings, "... Our contribution is to quantify how much of the rise of tech centers like Boston, Seattle, and San Francisco since the 1970s is due to a shift of patenting from the biggest population centers in 1980 like NYC and LA. The magnitudes are large: the 13.6% reduction from the 1970s to 2015-2019 in the patent share accounted for by the five largest population centers in 1980 is comparable to the combined patenting of the 238 MSAs with the least patenting in 2015-2019….”
Tech Cluster definition, "...Defining a tech cluster requires consideration of complementary inputs to patenting like venture capital investment.7 We follow Kerr and Robert-Nicoud (2020) and Rosenthal and Strange (2020) by using two criteria that reflect the scale and density of local tech activity: 1) the city ranks among the top 15 cities for patents and venture capital investment (the scale of activity) and 2) the city holds shares for patents, venture capital, employment in R&D-intensive sectors, and employment in digital-connected occupations that exceed its population share (the density of activity).
Six metropolitan statistical areas (MSAs8) satisfy these scale and density criteria: San Francisco, Boston, Seattle, San Diego, Denver, and Austin. New York and Los Angeles are ambiguous, as the cities hold large scale but fall short on several density requirements...."
Large cities, "...In 1980, the ten most populated MSAs were New York City, Los Angeles, Chicago, Philadelphia, Detroit, San Francisco, Washington DC, Dallas-Ft. Worth, Houston, and Boston. San Francisco (#6) and Boston (#10) are two of the identified tech clusters, and the next largest is San Diego at #17 in terms of the 1980 population ranking. Our analysis focuses on the reallocation of patenting from the five largest MSAs in 1980 in terms of population that rank ahead of San Francisco to tech centers...."




The vc giants’ newfound contrition comes on the back of a gigantic tech crash. The tech-heavy nasdaq index fell by a third in 2022, making it one of the worst years on record and drawing comparisons with the dotcom bust of 2000-01. According to the Silicon Valley Bank, a tech-focused lender, between the fourth quarters of 2021 and 2022, the average value of recently listed tech stocks in America dropped by 63%. And the plunging public valuations dragged down private ones (see chart 1). The value of older, larger private firms (“late-stage” in the lingo) fell by 56% after funds marked down their assets or the firms raised new capital at lower valuations. 









