China and the United States host the world's largest digital platforms. Platforms are multisided markets that facilitate value-creating exchanges among users, such as social media, e-commerce, software QJ;application downloads, search, email, and cloud services. Internet access and the purely digital nature of many of the products and services make digital platforms potentially global in scope. This means that the rules and restrictions governing the flow of capital and information services among national markets strongly influence the economic and social potential of digital platforms. The paper conducts a sequential analysis of the rise of barriers to the United States-China trade in ICT and digital platform markets from 2000 to 2021. We find that China's thriving platform economy was relatively open, competitive and market-driven in its early stages, and benefited from U.S. capital and the entry of U.S. firms. Since 2009, both countries have progressively restricted access to each other's domestic information services markets. In both cases, the primary stated rationale involved national security claims rather than trade policy concerns. Drawing on International Political Economy theory, we label the United States-China interaction pattern digital neomercantilism. Digital neo-mercantilism fuses the power and security of the national state with economic development in the digital economy. Policymakers represent information flows and digital technologies in domestic policy discourse as critical to the security and relative power of the state, and pursue various forms of industrial policy, data localization, trade protectionism, or exclusion of foreigners as a result. Both the United States and China are following this policy.
