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本文通过构建开放经济的三部门内生经济增长模型,基于本国技术进步不仅取决于本国资本和技术还取决于外国研发投入的假定,推导出经济均衡增长路径并以此构建计量模型,分别从全国和地区层面检验进口贸易技术溢出效应的存在性以及技术吸收能力对溢出效应的影响,同时从时间维度运用Granger因果检验和脉冲响应的方法对溢出效应进行再检验。研究发现:从全国来看,进口贸易总体上对经济增长率有显著正向影响,二者存在双向Granger因果关系;国内研发投入不利于技术溢出,而对外开放对溢出产生积极影响。从地区来看,东、中、西部都存在技术溢出效应,且东部效应大于中、西部;研发投入对东部的技术溢出起积极作用,而中、西部正向影响不明显;东部地区由于过高的进口比重和进口渗透率导致对外开放对溢出呈现负效应,而中、西部通过对外开放从技术溢出获得较快经济增长。
Based on the assumption that the domestic technological progress depends not only on the domestic capital and technology but also on the foreign investment in research and development, the paper deduces the path of balanced economic growth and constructs the econometric model based on the domestic economic growth model of the three sectors of the open economy. At the same time, Granger causality test and impulse response method were used to test the spillover effect from the time dimension and the impact of technology absorptive capacity on spillover effect. The findings are as follows: From a national point of view, the import trade as a whole has a significant positive impact on the economic growth rate with a two-way Granger causality; domestic R & D investment is not conducive to technology spillover, but opening up has a positive impact on spillover. In terms of regions, there is a technology spillover effect in the eastern, central and western regions, and the eastern effect is greater than in the central and western regions. R & D investment plays a positive role in technology spillovers in the east while the positive impact in the west and in the western regions is insignificant. In the eastern region, The proportion of imports and import penetration led to the opening up of the negative impact on the overflow, while the central and western regions through technological innovation to obtain rapid economic growth through opening up.