We present a North‐South model of international trade in which differentiated products are developed in the North. Sectors are populated by final‐good producers who differ in productivity levels. On the basis of productivity and sectoral characteristics, firms decide whether to integrate into the production of intermediate inputs or outsource them. In either case they have to decide from which country to source the inputs. Final‐good producers and their suppliers must make relationship‐specific investments, both in an integrated firm and in an arm’s‐length relationship. We describe an equilibrium in which firms with different productivity levels choose different ownership structures and supplier locations. We then study the effects of within‐sectoral heterogeneity and variations in industry characteristics on the relative prevalence of these organizational forms.

Multinational sales have grown at high rates over the last two decades, outpacing the remark-able expansion of trade in manufactures. Con-sequently, the trade literature has sought to incorporate the mode of foreign market access into the “new ” trade theory. This literature rec-ognizes that firms can serve foreign buyers through a variety of channels: they can export their products to foreign customers, serve them through foreign subsidiaries, or license foreign firms to produce their products. Our work focuses on the firm’s choice be-tween exports and “horizontal ” foreign direct investment (FDI). Horizontal FDI refers to an investment in a foreign production facility that