The Roots of Agricultural Innovation: Patent Evidence of Knowledge Spillovers
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This chapter investigates the extent to which agricultural innovations draw on ideas originating outside of agriculture. We identify a large set of US patents for agricultural technologies granted between 1976 and 2018. To measure knowledge spillovers to these patents, we rely on three proxies:
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美国国家经济研究局创建时间：
2020-04-01
