We develop a monopolistically competitive model of trade with firm heterogeneity - in terms of productivity differences - and endogenous differences in the ‘toughness’ of competition across markets - in terms of the number and average productivity of competing firms. We analyze how these...

In models with heterogeneous firms trade integration has a positive impact on aggregate productivity through the selection of the best firms as import competition drives the least productive ones out of the market. To quantify the impact of firm selection on productivity, we calibrate and...

We build a theoretical model of multi-product firms that highlights how market size and geography (the market sizes of and bilateral economic distances to trading partners) affect both a firm\'s ex-ported product range and its exported product mix across market destinations (the distribution of...

How many \"American jobs\" have U.S.-born workers lost due to immigration and offshoring? Or, alternatively, is it possible that immigration and offshoring, by promoting cost-savings and enhanced efficiency in firms, have spurred the creation of jobs for U.S. natives? We consider a multi-sector...

The global welfare implications of home market effects in trade models with imperfect competition are little understood. This paper proposes a simple model in which such implications can be easily analyzed. It shows an overall tendency of imperfectly competitive sectors to inefficiently cluster...

This paper depicts an industrial district as a center of innovation in which local technological externalities sustain the endogenous invention of new goods by profit seeking firms. After invention firms dace a crucial choice between reaching distant markets by export or plant delocation. The...

We introduce incomplete outsourcing contracts in an otherwise standard model of MNEs based on the trade-off between proximity and concentration. This has both positive and normative implications. As to the former, incomplete outsourcing contracts can account for the observed emergence of FDIs in...