This paper studies the value of diversification in global sourcing in improving firms' resilience to supply chain disruptions. I build a model in which firms select into importing from countries and via customs with different efficiencies, taking into account domestic and international trade...

We propose a sufficient statistics approach to measuring Ricardian comparative advantage based on a quantitative trade model simultaneously featuring cross-country differences in productivity, factor prices, and market size, as well as monopolistic competition, endogenous markups, and firm...

We study the role of firm heterogeneity and imperfect competition for global production networks and the gains from trade. We develop a quantifiable trade model with two-sided firm heterogeneity, matching frictions, and oligopolistic competition upstream. More productive buyers endogenously...