摘要：This paper posits a formal political economy model where the principle of
reciprocity in multilateral trade talks results in the gradual elimination of
tariffs. Reciprocity trade talks turn each nation’s exporters into
anti-protectionists at home; they lower foreign tariffs by convincing their own
government to lower home tariffs. Due to the new array of political forces, each
government finds it politically optimal to remove tariffs that it previously
found politically optimal to impose. The one-off global tariff cut then reshapes
the political economy landscape via entry and exit – reducing the size/influence
of import-competing sectors and increasing that of exporters. In the next round
of trade talks governments therefore find it politically optimal to cut tariffs
again. The process may continue until tariffs are eliminated
