This insightful volume brings together some of the major contributions to the controversy over - whether or not regionalism harms the multilateral system of trade negotiation. Topics that are examined include: the theory of preferential trade agreements; an overview of regionalism and multilateralism; the effects of regionalism on the multilateral system; the effects of multilateralism on regionalism; rules of origin and empirical analyses. Scholars and practitioners alike will find this an invaluable set of papers.