Innovations and Technological Spillovers
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In this paper we analyze the evidence from a large number of studies on three specific questions pertaining to R&D investment: (1) Are there diminishing returns to inventive activities? (2) What is the relationship between R&D and productivity and what are the magnitudes of the returns to a firm's
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美国国家经济研究局创建时间：
1993-08-01
