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urbanization externalities. We carry out patent and publication analyses for the city state of Hamburg during the period 1990 … specialization patterns. As nanotechnologies develop both industry specific and city specific externalities become effective leading …. -- general purpose technology ; nanotechnology ; specialization ; diversification ; Marshall-Jacobs controversy ; patent and …
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of externalities of both Marshall and Jacobs' type. Further factors influencing efficiency are spillovers within the …
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