MPIA Explained: WTO Appellate Arbitration by Professor Pauwelynn

The frozen fries case demonstrates that the MPIA can achieve efficiency goals, completing within 90 days with page limits on submissions. The MPIA was designed primarily to replicate the Appellate Body as provided in Article 17 of the DSU, with essential differences such as selection of arbitrators and clearer mandates for arbitrators on goals including efficiency and standard of review. Article 17.6 of the Anti-Dumping Agreement attempts to establish a standard of permissible interpretation for reviewing anti-dumping investigations, representing an attempt to transpose the Chevron Doctrine from American domestic law to international trade law. By the time disputes reach appellate review, parties are typically engaged in fundamental disagreements about what the defending member is required to do under covered agreements. The fundamental purpose of appellate review is not merely to declare who wins or loses but to ensure that if a WTO member must take action to change measures, stakeholders receive clear messages explaining why changes are necessary.

Faced with the Appellate Body impasse, Canada and the EU pioneered a bilateral interim appeal arbitration arrangement to secure dispute settlement rights between them. This work led to the establishment of the Multi-Party Interim Appeal Arbitration Arrangement (MPIAA), which now has 24 participants and is open to additional members. The MPIAA replicates the Appellate Body process but provides for certain procedural innovations. It remains a temporary measure until the Appellate Body functions again, with the priority being finding a multilateral solution that includes the US.

The Multi-Party Interim Appeal Arrangement (MPAA) is an alternative appeal mechanism announced by 16 WTO members, including several developing countries. It functions as a parallel option using WTO arbitration under Article 25 of the DSU while the Appellate Body remains non-functional. The MPAA incorporates procedural reforms including page limits, hearing limits, and a summary judgment process where arbitrators can advise parties to drop claims early. Nearly half of participants are developing countries, though small nations faced challenges due to limited human resources in Geneva. The MPAA is explicitly interim, with participating members stating their priority remains fixing the Appellate Body impasse. It serves as a testing ground for reforms that could be carried into long-term solutions.

When a case is appealed to the 11th Circuit Court of Appeals, the court issues an order directing parties to submit briefs by specific dates. The length of these briefing periods (two weeks versus 30-60 days) indicates whether the court is expediting the case or handling it normally. The appellant can request expedited treatment, but the court has discretion. The briefing schedule reveals the court's approach to the case's urgency and priority, which becomes apparent shortly after the appeal is filed.

Following the appellate body's collapse, several alternatives emerged with varying degrees of success. The Walker Report proposed reforms limiting appellate body work to 90 days and preventing precedent bindingness, but was deemed insufficient by the U.S. The MPIA (Multi-Party Interim Appeal Arbitration Arrangement) serves as a stopgap, but excludes major trading partners (U.S., India, Japan), lacks WTO Secretariat support, and uses arbitrators known for expansive jurisprudence. Ambassador Lighthizer proposed returning to single-stage dispute settlement, abandoning the two-tiered system entirely. These alternatives reveal fundamental disagreements about the appropriate role of international trade dispute resolution. The MPIA's limitations demonstrate how stopgap measures can perpetuate rather than resolve underlying institutional problems, particularly when key stakeholders remain excluded and the core issues of judicial activism and precedent bindingness are not adequately addressed.

Effective WTO dispute settlement reform requires focusing on institutional dimensions rather than procedural changes. Key proposals include establishing a permanent panel body of 18 WTO members appointed through screening processes to ensure expertise; requiring judges to appoint their own clerks rather than relying on potentially conflicted WTO Secretariat personnel; and ensuring independence from the Secretariat to maintain impartiality. The system also requires better economic expertise since issues like causality and injury determination cannot be adequately addressed without serious econometricians. Judges should not unilaterally choose between multiple interpretations of WTO provisions when the law is ambiguous; instead, they should return the ball to the legislative function and require members to clarify their intentions, recognizing that judges are agents, not legislators. The Director General should have more involvement in the process, with serious consultation first with major users of dispute settlement before pushing for consensus on improving institutional dimensions.

The WTO needs comprehensive reform across all three main functions: negotiation, monitoring, and dispute settlement. The dispute settlement system has become extremely activist, potentially hampering negotiation functions. The WTO needs to bring its rule books into the 21st century, addressing digital trade rules, competitive neutrality, level playing field, and intellectual property rights. The dispute settlement system also needs to be more accessible to all members, not just a handful of frequent users. The US and EU are committed to multilateralism and the WTO but also to their national security responsibilities. The institution needs reform to stay relevant in a changed geopolitical and economic context with greening and digitization of economies.

The WTO provides multiple mechanisms for addressing trade disputes, including consultations and the Appellate Body. China has filed consultations regarding electronic vehicles with the US and Canada. While the Appellate Body has been paralyzed, members increasingly use alternative dispute resolution methods. The WTO continues working on reforming the dispute settlement system. The organization's future is bright, driven by emerging trade developments in digital trade and green trade supporting net zero goals. The WTO operates on consensus, giving all members equal voice. China, as the second-largest economy, has been a strong multilateral supporter, though the WTO advocates for greater transparency on subsidies and information.

To restore a binding dispute settlement system with an appellate body that all WTO members are satisfied with, several elements need to be addressed: improving the appellate function to respond to US concerns, enhancing accountability of the appellate body and maintaining member independence, reorganizing the secretariat to provide better support, and defining standards of review more precisely. The standard of review needs to be better formulated, though there will always be some degree of constructive ambiguity.

The legal mechanism of the WTO dispute settlement body stopped working because the US blocked further operation. Most WTO reform blueprints, including those discussed across the global south, envisage revamping this legal mechanism to render it operational again. This would give the global organization the capability to settle disputes properly.

Beyond pandemic challenges, the book addresses systemic issues including revitalizing the multilateral trading system, analyzing the implications of the MPIA mechanism for dispute settlement jurisprudence, examining the US-China Phase One Deal's impact on WTO rules, understanding concerns about non-market economies, and evaluating whether plurilateral approaches including mega-regionals can resolve current negotiation deadlocks. The editors share a common view that international cooperation is essential for addressing these challenges.

As multilateral dispute settlement faces paralysis, members increasingly turn to plurilateral agreements among subsets of WTO members. The Multi-Party Interim Appeal Arbitration Agreement (MPIA) with over 50 members provides appellate-like mechanisms through ad hoc arbitration, while regional agreements like USMCA have established binding dispute settlement systems. Analysis reveals significant divergence in effectiveness: since July 2020, USMCA processed five disputes with four panels and swift decisions, while the WTO saw only one panel report despite 21 disputes filed. This fragmentation reflects legitimate concerns about multilateral dysfunction but risks undermining the coherence and universality of the global trading system. Canada's pragmatic multilateralism illustrates this tension—supporting multilateral systems primarily to leverage international weight against larger trading partners, particularly the US, which accounts for most Canadian trade. The US blockade of Appellate Body appointments diminished Canada's ability to use multilateral mechanisms effectively, forcing reliance on bilateral arrangements while remaining concerned that regional systems may simply transfer the same problems to new forums without solving underlying issues.

Two competing visions dominate international economic law: the unitary neoliberal convergence model (bringing all countries toward liberal capitalist democratic models) versus reforming existing systems. Neither strategy is likely or desirable in practice. While the WTO remains a cornerstone, a pluralist order is already emerging through proliferation of regional and preferential trade agreements. The key to legitimacy lies in overcoming the presumption that trade trumps non-trade issues (environmental sustainability, labor, etc.) and adopting principled approaches to managing coexisting priorities. Several types of arrangements can coexist: broader agreements recognizing normative diversity, narrower agreements with deeper cooperation on specific topics, and mechanisms addressing regulatory clashes rather than establishing common baselines. This pluralist approach accommodates different developmental paths while maintaining coherence across the fragmented system.

The current crisis affects the entire dispute settlement mechanism, not just the Appellate Body. Consultations have dropped dramatically from 50-80 per year to just three in 2020, indicating declining faith in the system. Claudia Orozco argues this erodes the monitoring function of the WTO and threatens its rule-making capacity, as members lose incentive to negotiate new rules without enforcement mechanisms. Alternative dispute settlement systems—bilateral, regional, or plurilateral—lack comprehensive coverage for anti-dumping measures and other trade remedy issues. The MPIA offers temporary relief but critics argue it incorporates problematic aspects of the AB's approach. Resolution requires consensus on acknowledging past errors and reforming the rigid case-law modality to allow backtracking, while preserving the two-tier system that 90% of members support.

Plurilateral agreements in Annex 4 of the WTO do not give MFN to non-members, can be changed without reference to non-members, and do not require consensus. If multiple plurilaterals with different memberships become critical mass, the system created to be inclusive, fair, and predictable would become non-inclusive, not fair, and completely unpredictable. This represents a fundamental transformation of the multilateral trading system from its foundational principles. The concern is that plurilaterals could hijack the multilateral trading agenda.