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Using patent citation data for the U.S., we test whether knowledge spillovers in biotechnology are sensitive to distance, and whether that sensitivity has changed over time. Controlling for self-citation by inventor, assignee and examiner, cohort-based regression analysis shows that physical...
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The Geography of Small Firm Innovation offers a unique look at the importance of geographic proximity to the innovative … activity of high-tech small firms. The book explores the concentration of innovation across metropolitan areas in the United … States during the 1990s, by introducing a novel measure of small-firm innovation based on the U.S. Small Business Innovation …
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