We suggest that there is some interface between the investment development path (IDP) and the trade development path (TDP)-with both trade and foreign direct investment (FDI) of created asset-intensive products increasing their signi cance relative to gross national product (GNP) of countries. The proportion of intra-industry trade and FDI to total trade and FDI also increases as an economy develops, particularly so for created asset-intensive products. We have taken the FDI intensity of manufacturing sectors as a proxy for a created asset intensity, and classi ed it into three categories, viz. above, average and below created asset intensities. Trade and FDI data from the Korean and Taiwan economies between 1968 and1997 generally support the idea of an integrated TDP and IDP. The growth of trade and FDI tends to be positively correlated with GNP per capita and with the created asset intensity of products.