This study begins with a brief survey of economic thought on the relationship between foreign trade and national power, from the Mercantilists on. Chapter II attempts a systematic theoretical approach to the subject. It first makes clear the fundamental basis of the possible use of foreign trade as an instrument of national power policy. Using well-known concepts of economic analysis, it proceeds to show under what conditions and by means of what policies this instrument is likely to attain its highest efficiency. The principles of power policy thus deduced theoretically are then compared...