“…where quality it is the firm's export product quality in logarithmic form, ofdi it represents the firm's OFDI, ln fdi it denotes FDI, ln med it represents the import of intermediate goods, ln rd it denotes firm R&D, V it is the relevant control variables, y t , y j , and y m are the year, industry, and region fixed effects, respectively, and e it is a random disturbance term. The impact of firms' OFDI, FDI, import of intermediate goods, and R&D behavior on export product quality is a continuous and dynamic process, that is, improvements in export product quality are not only related to the current OFDI, FDI, import of intermediate goods, and R&D but also influenced by export product quality in the previous period (L. Wang & Han, 2018). Therefore, the present study also uses the system generalized method of moment (GMM) to establish the following dynamic model:…”