Does State-level Upgrade of High-tech Zones Promote Urban Innovation Efficiency: Evidence from China

Among China's existing state-level High-tech Industry Development Zones (HIDZ), the number of upgraded ones account for more than 65%, which are supposed to fulfill the important mission of leading innovation. However, while the upgraded state-level HIDZ enjoy more opportunities than before, they also face major challenges such as the significant inter-generational differences between them and the born state-level HIDZ. Based on the panel data of Chinese (prefecture-level) cities from 2007 to 2015, the paper empirically examines the impact of the state-level upgrade of HIDZ on urban innovation efficiency by using a difference-in-differences propensity score matching approach (PSM-DID). The results show that the upgraded state-level HIDZ has significantly improved urban innovation efficiency, and this positive effect has gradually increased with the implementation of the upgrade policy. The further heterogeneity analysis shows that the higher the scientific research level of higher education institutions in the cities, the greater the promotion effect of the state-level upgrade. The paper evaluates the policy effect of the upgraded state-level HIDZ from their stated mission, which is a powerful complement to the existing research and provides more effective guidance for policy-makers.