The transformation of trade: the sources and effects of regime change

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Abstract
Regimes can be analyzed both as ‘outcomes to be explained’ and as mediating social institutions that affect international transactions. In the case of postwar trade, the changing outcomes can be predicted simply and with rough accuracy by a hegemonic model. Yet that model cannot explain the continuing reduction of tariffs, the development of new nontariff codes, and the persistence of crucial norms, rules, and institutions. These durable features of modern trade suggest that the logic of regime maintenance is distinct from that of regime initiation. Nor can the hegemonic model account for the regime's highly uneven weakening. The most prominent trade barriers are in mature, basic industries; the least prominent are in industries with differentiated products and extensive research and development expenditures. One explanation (which usefully complements a hegemonic model) is that sectors differ systematically in their capacity to adapt competitively to imports, and hence in their need to preserve their position by trade barriers. Despite the regime's uneven weakening, trade volumes have continued their secular growth. In sectors where the regime remains strong, it has stimulated two-way trade in similar products (intraindustry trade). Where the regime is weaker, new nontariff barriers diminish hypothetical trade growth but rarely aim at a permanent rollback in market shares or trade volume.