Ralph Ossa

Ralph Ossa was chief economist of the World Trade Organization from January 2023 until June 2025. He holds a UBS Foundation Professorship in Economics at the University of Zurich. This essay is based on Ralph Ossa, “The Multilateral Trading System: Resilience, Erosion, and the Role of Middle Powers,” UBS Center Public Paper #16, May 2026, published by the UBS Center for Economics in Society at the University of Zurich.