A ricardian model with endogenous comparative advantage and endogenous trade policy regimes

This paper develops a Ricardian model with transaction costs and endogenous and exogenous comparative advantages. It shows that the level of division of labour and trade increases as transaction conditions improve. It identif ies the conditions for trade negotiations that result in zero tariff rates and the conditions for the coexistence of unilateral tariff protection and unilateral laissez faire policies. The model may explain the policy transfo rmation of some European governments from Mercantilism to laissez faire in the 18th and 19th century and policy changes in developing countries from p rotection tariff to trade liberalization and tariff negotiation.