Abstract
We introduce time and risk into the fixed-variable cost tradeoff in heterogeneous firm trade models: Investing in exporting gradually and stochastically lowers the costs of exporting. In the model, aggregate trade dynamics arise from producer-level decisions to invest in lowering their future variable export costs, and tariff reforms generate time-varying trade elasticities. The gains from reducing tariffs arise from substituting away from firm creation and towards exporting. This substitution is larger when new exporters are smaller and take longer to grow into successful exporters. The welfare gains from reducing tariffs are much larger than the long-run changes in consumption and the welfare gains cannot be recovered from a static model or from formulas based on those models. Comparing steady-state outcomes can predict a welfare loss from reform when the actual change is positive.
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