研发投入与经济增长 ——总需求冲击影响长期增长的一个机制探讨*
摘 要：传统的宏观经济学认为，短期波动不会对经济的长期增长造成影响。然而现实中，一些国家和地区的经济在遭受短期性冲击后，却长期地陷入停滞或缓慢增长的困境中。本文运用动态一般均衡模型，探讨了总需求冲击影响长期增长的一个可能机制。总需求冲击通过对研发投入和技术进步的影响作用于产出增长率，从而改变经济的长期增长。通过计量分析本文对模型的结论予以了检验，并试图提出新的启示。
关键词：总需求冲击、长期增长、R&D投入、技术进步
R&D Investment and Economic Growth ——An Inquiry on the Mechanism that Aggregate Demand Shock Affects Long-Run Growth Changsheng Xu Shuyang Sheng
Abstract: Traditional macroeconomics believes that short-run fluctuation had no effect on the long-run economic growth. In fact, however, some countries and areas sank into long recessions or slow growth after suffering short-run shock. By constructing a dynamic general equilibrium model, this paper tries to inquire a possible mechanism that the short-run aggregate demand shock may affect the long-run growth. Aggregate demand shock has effect on the GDP growth rate through its influence on the R&D investment and technological progress, which will change the long-run economic growth path. Through the econometric analysis the paper tests the conclusion of the model and gives two proposals eventually.
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