高铁开通与企业跨区域合作创新水平的提升OA北大核心CHSSCDCSSCICSTPCD

Strengthening enterprises'cross-regional cooperative innovations plays an important part in the construction of an innovative country.This paper collects the detailed cooperative patent application data of Chinese A-share listed companies from 2005 to 2019,and uses the difference-in-differences method to test the impacts of the opening of high-speed railway(HSR)on enterprises'cross-regional cooperative innovations.The study finds that the opening of HSR significantly improves the number of enterprises'cross-regional cooperative patent applications.This conclusion is also robust after the common trend test,placebo test,using the variable that whether a city opened the railway in 1945 as an instrument variable and different estimation methods.The mechanism test shows that the opening of HSR enhances enterprises'cross-city cooperative innovation mainly through the substitution effect of cross-city for intra-city cooperative innovation,technological upgrading effect,rather than the spatial competition effects of"zero-sum games"between regions.Further analysis reveals that the opening of HSR leads to the spatial distribution of enterprises'cooperative innovation partners moving to a longer distance,and has a greater role in promoting cross-city cooperative innovation of firms which are in non-high-tech industries and far away from the urban center.This paper provides new insights to promote enterprises'cross-regional cooperative innovation and build a regional coordinated national innovation system by the construction of HSR.