Measured Aggregate Gains from International Trade
研究了主流贸易模型如何影响统计机构测度的总生产率、实际GDP和实际消费对贸易成本变化的反应，发现测度生产率变化等于国内可变贸易成本变化的出口份额加权平均的倒数，且实际消费能捕捉福利的一阶效应。
We examine the implications of workhorse trade models for how aggregate productivity, real GDP and real consumption, as measured by statistical agencies, respond to changes in trade costs. In a range of models, changes in measured productivity are equal to the inverse of an export-share weighted average of changes in variable trade costs incurred domestically. Under certain conditions, despite the multiple biases in the CPI, measured real consumption captures the first-order effects of changes in variable trade costs on welfare. Through the lens of these results, we interpret some of the empirical work on measured gains from trade.