Trade Policy Implications of a Changing World: Tariffs and Market Power.

A major economic rationale for trade agreements is limiting mutually harmful terms-of-trade externalities. We analyse the impact of market power on tariff commitments of original and acceded WTO members. As countries grow, their market power in different sectors can change in unforeseen ways. To quantify the economic significance of our estimates, we compare actual and predicted tariff commitments under current market power. We find that tariff cuts required to reflect current economic conditions would amount to up to $26.4 billion – nearly 10% of global tariff costs. In the past, the GATT/WTO system has updated tariff commitments through periodic 'rounds', and our findings support the long-overdue revival of the WTO's negotiation function. [ABSTRACT FROM AUTHOR]