This paper investigates how intra-industry trade (IIT) is linked to cross-country income difference and foreign direct investment (FDI). We distinguish IIT as either horizontally or vertically differentiated, using bilateral exports and imports data for Japan and the remaining East Asian countries at the SITC five-digit level over 1990–2000. Our results show that the income difference has a negative relationship with the share of horizontal IIT, but a positive relationship with vertical IIT, and that cross-country FDI has a positive relationship with share of horizontal IIT and a negative relationship with share of vertical IIT.

South Korea recently signed a free trade agreement (FTA) with Chile and is currently negotiating or studying bilateral FTAs with about 20 countries. However, some South Koreans oppose such agreements because they fear that trade liberalization would result in costly factor adjustment. Many researchers believe that intra-industry trade expansion generates smaller inter-industry factor adjustment (and therefore lower costs) compared with the costs associated with inter-industry trade expansion. This paper analyzes the extent and nature of intra-industry trade and marginal intra-industry trade in South Korea, to help predict the relative costs it might face upon opening its markets to various countries.