Quantitative Analysis of The Effects of Tariff Policy On The Financial Performance of Cross-Border E-Commerce Companies

Various economic actors have shown a growing interest in the study of cross-border trade, closely linked to the development of international com-merce through e-commerce platforms. In this context, this study analyzes the effects of tariff policies on the economies of China and the United States, as well as their impact at the corporate level, using PDD Holdings Inc. as a case study. The research employs tools from portfolio theory, specifically the mean-variance model, to evaluate how tariff variations affect trade and fi-nancial dynamics. The evidence suggests that changes in tariffs are reflected in the management of the spread between exports and imports, both at the macroeconomic and corporate levels. The data reflect greater risk exposure for China, due to its greater exposure to international export prices compared to the United States. Furthermore, it is evident that this environment incentiv-izes companies to design hedging strategies, diversifying their portfolios into financial investments separate from their main operating activities. This strat-egy, implemented by PDD Holdings Inc., seeks to mitigate risks arising from market volatility and protect the interests of its stakeholders, strengthening its resilience in the face of international uncertainty. These results are of interest to regulators, business leaders, investors, and portfolio managers for their decision-making