Horag Choi

Trade Adjustment Dynamics and the Welfare Gains from Trade

We build a micro-founded two-country dynamic general equilibrium model in which trade responds more to a cut in tariffs in the long run than in the short run. The model introduces a time element to the fixed-variable cost trade-off in a heterogeneous producer trade model. Thus, the dynamics of aggregate trade adjustment arise from producer-level decisions to invest in lowering their future variable export costs. The model is calibrated to match salient features of new exporter growth and provides a new estimate of the exporting technology. At the micro level, we find that new exporters commonly incur substantial losses in the first three years in the export market and that export profits are backloaded. At the macro level, the slow export expansion at the producer level leads to sluggishness in the aggregate response of exports to a change in tariffs, with a long-run trade elasticity that is 2.9 times the short-run trade elasticity. We estimate the welfare gains from trade from a cut in tariffs, taking into account the transition period. While the intensity of trade expands slowly, consumption overshoots its new steady-state level, so the welfare gains are almost 15 times larger than the long-run change in consumption. Models without this dynamic export decision underestimate the gains to lowering tariffs, particularly when constrained to also match the gradual expansion of aggregate trade flows.

Trade Integration and the Trade Balance in China

We study China’s growth and integration (trade and financial) in a two-country DSGE model with a dynamic exporting decision, pricing-to-market, incomplete financial markets, and aggregate shocks to trade barriers, productivity, and preferences. We estimate the changes in technology, trade costs, and preferences accounting for the dynamics of China’s gross and net trade flows, export participation, real exchange rate, and growth from 1990 to 2014. We find a large unanticipated decline in bilateral trade barriers with persistent, but not permanent, innovations that include an important gradual, phased-in component. Since the Great Recession, average bilateral barriers have stabilized at low levels even as barriers on Chinese imports have risen substantially relative to exports. Trade stagnation since 2011 largely reflects the completed transition to past trade reforms rather than an increase in trade barriers or reversal in the expected pace of future integration. Trade is forecast to decline almost 1 percent per year starting in 2017. Changes in trade barriers are an important determinant of China’s trade balance and its accumulation of foreign assets, accounting for as much as 70 percent of the foreign assets accumulated by 2014. Shocks to trade barriers and in China are found to have increased ROW consumption by 11.9 percent and employment by 0.6 percent but lowered ROW output by less than 1 percent relative to 1990.