Silicon Valley typical of US R&D geography

Research and development (R&D) activity in the US tends to be heavily geographically concentrated, a paper published by the Philadelphia Federal Reserve finds.

The paper states that spatial concentration is even more pronounced among firms doing basic R&D research than it is for economic activity.

Although the US has more than 3100 counties, the 50 counties that contain the largest number of R&D labs account for almost 60% of all such labs, while the top 50 counties in terms of the overall

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