Considering the double asymmetric emission reduction strategy of finance and information between port and shipping cooperation under carbon tax

: Vertical cooperation is a key decision for port and shipping supply chain members to achieve energy saving and emission reduction goals. In this study, a three-stage Stackelberg model is constructed by considering a green emission reduction investment strategy in a two-level port and shipping supply chain consisting of a port and two shipping companies with financial asymmetry and asymmetric information under carbon tax regulation, and introducing factors such as carbon tax regulation and variable costs. Among them, the port maintains a long-term information-sharing partnership with the financially weak shipping company, which competes with the financially strong shipping company for Cournot, and the port provides loading and unloading services for both shipping companies. The study shows:(1) The port's abatement investment coefficient and information sharing discount simultaneously affect the level of abatement. (2) Emission reduction investment coefficient and information sharing cooperation discount are important influencing factors for the port to benefit from vertical cooperation (3) When port and shipping companies focus more on developing a certain cooperation strategy, or the cooperation intensity of both capital investment and information cooperation is more balanced, the port is more likely to benefit from investing in shipping companies with weak capital.