Research On The Impact Of New Infrastructure Investment On High-quality Economic Development

China has shifted to the stage of high-quality development,GDP in 2020 exceeded 10 trillion yuan,the total economic volume ranked second in the world,but still accompanied by urban and rural areas of the income gap is large,innovation ability can not meet the requirements of high-quality development and other unbalanced development problems,continue to promote high-quality economic development is the top priority.How to improve high-quality economic development? On the one hand,new infrastructure investment can accelerate product research and development,provide more application scenarios,promote business model innovation,use existing technologies to optimize and improve traditional infrastructure investment,expand product demand in the short term,promote economic growth,adjust the economic structure in the long run,improve people’s livelihood and welfare,and promote high-quality economic development;on the other hand,with the rapid development of a new generation of information technology,Integrating technology and scientific research and increasing the proportion of investment in new infrastructure can provide information platforms for all regions,lay a good foundation for further promoting the development of the digital economy,and promote the balanced development of the high-quality level of the regional economy.Based on reality and from the perspective of new infrastructure investment,this thesis attempts to study the impact of the scale and structure of new infrastructure investment in the process of high-quality economic development,and explores how to make good use of new infrastructure investment to improve the level of high-quality economic development in China.This thesis uses the data from 2010 to 2019 to build an indicator system for high-quality economic development with innovation,coordination,green,openness and sharing as first-level indicators,and uses a two-way fixed effect model to analyze the impact and mechanism of new infrastructure investment scale and structure on high-quality economic development from multiple angles such as overall,intermediary role and regional heterogeneity.Through empirical analysis,the following conclusions are mainly obtained: First,new infrastructure investment has a positive role in promoting high-quality economic development,and both information technology investment and scientific research investment can improve the high-quality economic development index,but scientific research investment promotion effect is stronger;second,the analysis of the indirect impact of new infrastructure investment finds that new infrastructure investment can enhance high-quality economic development by promoting technological progress,attracting human capital,and optimizing the intermediary effect of industrial structure;third,Analyzing the heterogeneity of new infrastructure investment in different regions on high-quality economic development,it is found that the effect of new infrastructure investment divided into eastern,central and western regions is more obvious in the western region.The influence of information technology investment in the central and eastern regions is more prominent,while investment in scientific research is more important in the high-quality economic development of the western region.The heterogeneity of the urbanization rate shows that investment in scientific research has a significant impact on both types of regions,while for areas dominated by local urbanization,increasing investment in information technology has not significantly improved the level of high-quality economic development.Finally,combined with the conclusions of empirical research,this thesis puts forward the following policy recommendations:(1)appropriately increase investment in new infrastructure and broaden funding channels;(2)make overall plans to promote and optimize the investment structure;(3)coordinate regional development according to local conditions.