The Gains from Input Trade with Heterogeneous Importers
研究了企业参与进口投入品市场的差异，提出一种利用企业层面数据衡量投入品贸易总体效应的方法，发现投入品贸易使法国制造业产品价格下降27%。
Firms differ substantially in their participation in foreign input markets. We develop a methodology to measure the aggregate effects of input trade that takes such heterogeneity into account. We provide a theoretical result that holds in a variety of settings: the firm-level data on value added and domestic expenditure shares in material spending is sufficient to compute the change in consumer prices due to a shock to the import environment. We characterize the bias of approaches that rely on aggregate statistics. In an application to French data, input trade reduces the prices of manufacturing products by 27 percent.