They Don't Invent Them Like They Used To: An Examination of Energy Patent Citations Over Time
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This paper uses patent citation data to study flows of knowledge across time and across institutions in the field of energy research. Popp (2002) finds the level of energy-saving R&D depends not only on energy prices, but also on the quality of the accumulated knowledge available to inventors.
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美国国家经济研究局创建时间：
2005-06-01
