The paper presents an eclectic theory of international production, emphasizing the roles of ownership-specific and location-specific advantages in explaining the industrial patterns and geographical distribution of U.S. affiliates in fourteen manufacturing industries across seven countries in 1970. The theory posits that firms engage in international production when they possess unique assets (ownership advantages) and when foreign markets offer better opportunities than domestic ones (location advantages). Ownership advantages include proprietary knowledge, technology, and organizational skills, while location advantages involve factors like natural resources, labor, and market structures. The paper evaluates these factors through empirical tests, showing that ownership advantages are crucial for firms to internalize their assets, while location advantages determine the profitability of foreign production. The study tests two main hypotheses: one related to international competitiveness (H1) and another concerning location advantages (H2). H1 suggests that the competitive advantage of U.S. firms in foreign markets is influenced by both ownership and location-specific factors. H2 argues that the choice between exporting and local production depends on the relative attractiveness of home and host country location-specific advantages. The empirical analysis uses data on U.S. multinationals in seven countries, focusing on variables such as productivity, profitability, market size, and wage differentials. The results indicate that relative market size and skilled employment ratio are significant in explaining U.S. firms' participation in foreign markets. For H2, the export/import ratio and net income to sales are significant in explaining the export/local production ratio. The paper concludes that the eclectic theory of international production, which combines ownership and location advantages, provides a more comprehensive explanation of international production than either factor alone. The findings support the theory's ability to account for the complex interplay between ownership and location-specific advantages in determining the patterns of international production and trade.The paper presents an eclectic theory of international production, emphasizing the roles of ownership-specific and location-specific advantages in explaining the industrial patterns and geographical distribution of U.S. affiliates in fourteen manufacturing industries across seven countries in 1970. The theory posits that firms engage in international production when they possess unique assets (ownership advantages) and when foreign markets offer better opportunities than domestic ones (location advantages). Ownership advantages include proprietary knowledge, technology, and organizational skills, while location advantages involve factors like natural resources, labor, and market structures. The paper evaluates these factors through empirical tests, showing that ownership advantages are crucial for firms to internalize their assets, while location advantages determine the profitability of foreign production. The study tests two main hypotheses: one related to international competitiveness (H1) and another concerning location advantages (H2). H1 suggests that the competitive advantage of U.S. firms in foreign markets is influenced by both ownership and location-specific factors. H2 argues that the choice between exporting and local production depends on the relative attractiveness of home and host country location-specific advantages. The empirical analysis uses data on U.S. multinationals in seven countries, focusing on variables such as productivity, profitability, market size, and wage differentials. The results indicate that relative market size and skilled employment ratio are significant in explaining U.S. firms' participation in foreign markets. For H2, the export/import ratio and net income to sales are significant in explaining the export/local production ratio. The paper concludes that the eclectic theory of international production, which combines ownership and location advantages, provides a more comprehensive explanation of international production than either factor alone. The findings support the theory's ability to account for the complex interplay between ownership and location-specific advantages in determining the patterns of international production and trade.