a b s t r a c tThis paper documents that intermediaries play an important role in facilitating international trade. We modify a heterogeneous firm model to allow for an intermediary sector. The model predicts that firms will endogenously select their mode of export -either directly or indirectly through an intermediary -based on productivity. The model also predicts that intermediaries will be relatively more important in markets that are more difficult to penetrate. We provide empirical confirmation for these predictions using the firm-level census of China's trade, and generate new facts regarding the activity of intermediaries. We also provide evidence that firms begin to export directly after exporting through intermediaries.

We provide systematic evidence that intermediaries play an important role in facilitating trade using a firm-level the census of China's exports. Intermediaries account for around 20% of China's exports in 2005. This implies that many firms engage in trade without directly exporting products. We modify a heterogeneous firm model so that firms endogenously select their mode of export-either directly or indirectly through an intermediary. The model predicts that intermediaries will be relatively more important in markets that are more difficult to penetrate. We provide empirical confirmation for this prediction, and generate new facts regarding the activity of intermediaries.

This paper provides a theory model of trade finance to explain the "great trade collapse."The model shows that, first, the riskiness of international transactions rises relative to domestic transactions during economic downturns, and second, the exclusive use of a letter of credit in international transactions exacerbates a collapse in trade during a financial crisis. The basic model considers banks' optimal screening decisions in the presence of counterparty default risks. In equilibrium, banks will maintain a higher precision screening test for domestic firms and a lower precision screening test for foreign firms, which constitutes the main mechanism of the model.

This study revisits a central assumption of standard trade models: constant marginal cost technology. The presence of increasing marginal costs for exporters introduces significant market interdependence across borders missing from traditional models of international trade that rely on constant marginal cost technology. Such market interdependence represents an additional channel through which local shocks are transmitted globally. To identify increasing marginal cost at the level of the firm, we build in flexible production assumptions that nest increasing, decreasing, and constant marginal cost technology to an otherwise standard international trade model. We derive an estimating equation that can be taken directly to the data. Our structural equation explicitly guides our inference on the shape of the marginal cost curve from estimated coefficients. The results suggest that increasing marginal cost is predominant at the firm level. Moreover, utilizing plant‐level information on physical and financial capacity constraints, we find that the degree of increasing marginal cost is significantly exacerbated by both types of constraints. The evidence suggests that access to larger markets through greater international integration may not have the expected welfare gains typically predicted in standard models. (JEL F12, F14)

This study identifies and provides an estimate of the impact of bank liquidity shocks on real economic activity by exploring letter‐of‐credit import transactions in Colombia during the 2008 to 2009 global financial crisis. The detailed dataset on letter‐of‐credit transactions allows for exploiting within‐importer–exporter variation across issuing banks. The study finds substantial effects of bank liquidity shocks on letter‐of‐credit import transactions: banks that were more vulnerable to adverse liquidity shocks—proxied by the ex ante reliance on wholesale funding or borrowings from foreign banks—reduced letter‐of‐credit issuances more in both intensive and extensive margins. The study also confirms that it had real effects: importer–exporter pairs that relied more on letter‐of‐credit transactions experienced a greater reduction in their total imports in response to adverse bank liquidity shocks.