**Introduction** Data localization policies affect global digital trade by increasing compliance and infrastructure costs, fragmenting digital markets, and altering cross-border digital services trade. By restricting where data can be stored or processed, these policies operate as regulatory barriers that directly affect trade in digitally delivered services such as cloud computing, financial services, and e-commerce[1][2]. The resulting trade effects are uneven across firms and economies, with smaller firms and countries with limited digital infrastructure facing higher relative burdens[1][3]. **Data flows as trade infrastructure** Cross-border data flows underpin trade in digitally delivered services and increasingly support goods trade through payments, logistics, and supply-chain coordination[1]. Restrictions on data transfers interfere with firms’ ability to operate integrated digital systems across jurisdictions and function in practice as non-tariff barriers rather than purely domestic regulatory measures[1][2]. As data-intensive inputs become embedded across sectors, constraints on data flows increasingly shape trade outcomes and market access conditions[1]. **How data localization reshapes digital trade** **1.** **Cost and market access effects on cross-border services** Data localization requirements raise costs by requiring firms to duplicate data storage and processing infrastructure across jurisdictions, undermining economies of scale central to cloud computing and platform-based services[2]. These additional fixed costs reduce the commercial viability of cross-border service provision, particularly in data-intensive sectors such as cloud services, payments, and IT-enabled services[1][2]. For example, India’s localization requirements for domestic storage of payments data limit centralized processing and increase compliance costs for foreign providers, narrowing the scope for cross-border service delivery relative to regulatory regimes that permit cross-border data transfers subject to safeguards[2][4]. **2.** **Fragmentation of digital markets and loss of scale economies** Localization policies prevent firms from relying on regional or global data hubs, forcing jurisdiction-specific data architectures that reduce interoperability between markets[1][2]. This fragmentation weakens competition and reduces the tradability of digital services by increasing operational complexity for firms operating across borders[1]. China's data governance framework restricts outbound data transfers and imposes security review requirements that separate domestic and international data operations, which constrains the integration of China-based activities into global digital networks. These measures affect cross-border e-commerce, cloud services, and digital supply-chain coordination by reinforcing market segmentation along regulatory lines[1][5]. **3.** **Asymmetric effects on SMEs and developing economies** The trade effects of data localization are asymmetric. Large multinational firms are better able to absorb compliance costs and invest in localized infrastructure, while small and medium-sized enterprises (SMEs) depend heavily on cross-border platforms and cloud services to reach foreign markets[1][4]. Localization reduces access to these channels, raising entry barriers and limiting SME participation in digital trade[1][4]. In many developing economies, limited domestic data infrastructure amplifies these effects. Localization requirements deter digital investment, raise the cost of digital services, and reduce access to foreign technology providers, weakening participation in digital value chains and constraining export competitiveness[3]. **Conclusion** Data localization policies reshape global digital trade by increasing costs, fragmenting markets, and reinforcing asymmetries between firms and economies[1][2]. While often motivated by regulatory or security objectives, these policies function as structural trade barriers when broadly applied to cross-border data flows[1][5]. As digital trade expands across sectors, widespread localization contributes to a more segmented global digital economy, with reduced efficiency, weaker competition, and limited inclusivity[1][3].
