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Date: 2009-08-12 15:38:48Imperfect competition Monopoly Cognitive science Knowledge spillover Rivalry Herfindahl index Research and development JEL classification codes Externality Economics Knowledge Economic geography | The Geography of Research and Development Activity in the U.S.Add to Reading ListSource URL: www.philadelphiafed.orgDownload Document from Source WebsiteFile Size: 2,49 MBShare Document on Facebook |