Private and Social Returns to R&D: Drug Development and Demographics
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https://www.nber.org/papers/w28355
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Investment in intangible capitalin particular, research and developmentincreased dramatically since the 1990s. However, productivity growth remains sluggish in recent years. One potential reason is that a significant share of the increase in intangible investment is geared toward consumer products
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美国国家经济研究局创建时间：
2021-01-01
