1. See G. C. Hufbauer, Synthetic Materials and the Theory of International Trade (London, 1965).
2. See S. Hirsch, Location of Industry and International Competitiveness (Oxford, 1967).
3. See L. T. Wells, ‘Tests of a Product Cycle Model of International Trade’, Quarterly Journal of Economics, 83 (1969), 152–62.
4. For a recent comparison of US and Japanese patterns of foreign direct investment see K. Kojima, ‘A Macroeconomic Approach to Foreign Direct Investment’, Hitotsubashi Journal of Economics, 14(1973), 1–21