The bilateral effects of foreign direct investment on green innovation efficiency: Evidence from 30 Chinese provinces

The importance of dealing with the relationship between foreign direct investment (FDI) and green innovation for sustainable development is being highlighted. However, since FDI can have both positive and negative effects on sustainable development, coupled with regional differences and different development conditions, there is uncertainty about the relationship between FDI and green innovation. Based on the panel data of 30 provinces in China from 2007 to 2018, this paper uses the two-tier stochastic frontier model to decompose the positive and negative effects of FDI on green innovation in different time periods and provinces, and considers the role of regional conditions that lead to regional differences in the green innovation effects of FDI, in order to better provide precise research findings for analyzing the relationship between FDI and green innovation in different provinces in China. First, empirical research shows that the inhibition effect of FDI on green innovation efficiency is smaller than the promotion effect, which makes the combined effect not obviously positive. The average inhibition effect of FDI on green innovation efficiency is 0.0041 and the average promoting effect is 0.0047, which makes the combined effect averaged 0.0006. Second, there are regional differences in the driving effect of FDI on green technology innovation. The western region's FDI has a greater drive effect on the efficiency of green innovation than the central and eastern regions. Third, the promoting effect character of FDI on green innovation efficiency is a “U" type with 70% percentile of the environmental regulation intensity as the inflection point. Due to the imperfection of China's economic structure at this stage, China's relatively developed regions have not yet established the market and industrial structure advantages to fully release the green innovation effect of FDI. Based on the research conclusions, to better promote green innovation efficiency, it is necessary to overcome the disadvantages of the green innovation process dominated by the central government, cultivate and develop green innovation markets, adopt incentive initiatives for foreign enterprises with green technology spillover effects, implement policies to address regional differences, and strengthen the interaction mechanism between FDI and green technology innovation in home countries.