Borders and distance in kowledge spillovers: dying over time or dying with age? evidence from patent citations
This paper uses a gravity framework to investigate the effects of distance as well as subnational and national borders in knowledge spillovers. Drawing on the NBER Patent Citations Database, we examine patent citations data at metropolitan level within the U.S. and the 38 largest patent-cited countr...
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| Format: | UnknownFormat |
| Sprache: | eng |
| Veröffentlicht: |
Munich
Univ., Center for Economic Studies
2009
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| Schriftenreihe: | CESifo working paper series Trade policy
2625 |
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