R&D, International Sourcing, and the Joint Impact on Firm Performance
研究研发成本冲击如何影响研发投资和进口中间品，以及两者对企业绩效的联合影响，发现研发与国际采购是互补活动，并利用挪威2002年研发税收抵免政策验证了这一点。
This paper studies the impact of an R&D cost shock on R&D investments, imported inputs, and their joint impact on firm performance. We introduce imported inputs into a model of R&D and endogenous productivity, and show that R&D and international sourcing are complementary activities. Exploiting the introduction of an R&D tax credit in Norway in 2002, we find that cheaper R&D stimulated not only R&D investments but also imports of intermediates, quantitatively consistent with the model. An implication of our work is that improved access to imported inputs promotes R&D investments and, ultimately, technological change.