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http://hdl.handle.net/10419/23232
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| Title: | | It?s a Small(er) World: The Role of Geography and Networks in Biotechnology Innovation  |
| Authors: | | Johnson, Daniel K.N. Mareva, Milena |
| Issue Date: | | 2002 |
| Series/Report no.: | | Working Papers / Wellesley College, Department of Economics 2002,01 |
| Abstract: | | Using patent citation data for the U.S., we test whether knowledge spillovers in biotechnology are sensitive to distance. Controlling for self-citation by inventor, assignee and examiner, cohort-based regression analysis shows that spillovers are local but that distance is becoming less important with time. Network analysis paints a picture of a stable network between states, but a changing environment between individual actors, with a growing importance of connectedness. The popular maxim that everyone is connected by six degrees of separation is tested with surprising results. |
| JEL: | | N9 O3 R1 L6 |
| Document Type: | | Working Paper |
| Appears in Collections: | | Working Papers, Department of Economics, Wellesley College
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