**Introduction** A functioning dispute settlement mechanism is essential for the World Trade Organization (WTO) to remain fully effective as a rules-based institution. While the WTO can still provide negotiation forums, transparency functions, and trade monitoring without an operational appellate system, the absence of enforceable dispute settlement significantly weakens its credibility, predictability, and ability to constrain unilateral trade actions. The paralysis of the Appellate Body since 2019 has demonstrated that trade rules lose effectiveness when members cannot reliably enforce them through binding adjudication. **Contextual background** The WTO’s dispute settlement system was designed to provide binding, rules-based resolution of trade disputes between member states. Its Appellate Body served as the final legal authority reviewing panel decisions under the WTO’s Dispute Settlement Understanding (DSU). However, the Appellate Body became nonfunctional after appointments were blocked and the terms of remaining members expired in 2020, leaving the WTO without a fully operational appeals mechanism[1]. This institutional breakdown emerged during a broader period of rising geopolitical tensions, industrial policy expansion, and increasing use of tariffs, export controls, and subsidy programs. As governments increasingly prioritize strategic and security objectives in trade policy, enforceable multilateral disciplines have become more difficult to sustain[2]. **Why dispute settlement is critical to WTO effectiveness** **1.** **Enforcement gives credibility to WTO rules** The WTO’s effectiveness depends not only on negotiated agreements but also on the ability to enforce those agreements impartially. Binding dispute settlement transformed the WTO from a largely diplomatic framework under the General Agreement on Tariffs and Trade (GATT) into a more legalized system with enforceable obligations. Without an operational appellate mechanism, members can appeal panel decisions “into the void,” preventing rulings from becoming legally binding. This weakens compliance incentives and allows contested trade measures to remain in place indefinitely[1]. As enforcement credibility declines, members increasingly rely on unilateral retaliation or bilateral pressure instead of multilateral adjudication. **2.** **Smaller economies depend heavily on binding adjudication** A functioning dispute settlement mechanism is particularly important for smaller and developing economies that lack the economic leverage to challenge larger powers outside a rules-based framework. Binding adjudication reduces the importance of relative market size and provides smaller members with institutional means to contest discriminatory measures. The weakening of dispute settlement disproportionately advantages larger economies capable of using tariffs, subsidies, or coercive trade tools without facing effective legal constraints. This undermines one of the WTO’s core functions: providing predictability and legal equality among members regardless of economic power[3]. **3.** **Dispute settlement supports stability and investment confidence** Predictable trade rules reduce uncertainty for firms engaged in global supply chains and cross-border investment. The WTO dispute settlement system historically contributed to this stability by clarifying obligations and discouraging arbitrary trade restrictions. The paralysis of the Appellate Body has coincided with rising tariffs, retaliatory trade measures, and broader fragmentation of the trading system[2]. Although alternative arrangements such as the Multi-Party Interim Appeal Arbitration Arrangement have emerged, these mechanisms cover only subsets of WTO members and do not fully replace a universal appellate system[4]. **4.** **The WTO can still function partially without it** Despite these weaknesses, the WTO has not become irrelevant. The organization continues to perform important functions including trade monitoring, committee work, negotiations, technical assistance, and data collection. Many disputes are also resolved through consultations before litigation escalates[5]. In addition, members continue to bring disputes to WTO panels even without a fully functioning Appellate Body, indicating that governments still value the institution’s legal and diplomatic framework[5]. However, the long-term effectiveness of the WTO as a rules-enforcement body is substantially reduced without a restored dispute settlement system. **Conclusion** The WTO does not cease to exist without a functioning dispute settlement mechanism, but its effectiveness as a rules-based institution is significantly diminished. Binding adjudication is central to enforcing commitments, protecting smaller economies, and maintaining predictability in global trade relations. The continued paralysis of the Appellate Body risks shifting the trading system toward greater unilateralism and power-based bargaining. While interim mechanisms and diplomatic functions partially sustain the WTO, restoring a credible and universally accepted dispute settlement system remains critical for preserving the organization’s long-term authority and relevance.
