integration)? Which firms choose to expand their sourcing activities across the national border (offshoring)? This letter provides … vertical integration and of offshoring tend to have been more productive ex ante than firms choosing not to do so. This finding …

distinguish between domestic and foreign sourcing, as well as between outsourcing and vertical integration. A firm's choice is … model. -- productivity ; outsourcing ; intra-firm trade ; foreign direct investment ; incomplete contracts ; firm-level data …