When the rules governing the international payments system were worked out at Bretton Woods in 1944, their object was to free international trade from restraints. Trade, the expansion and balanced growth of trade, was the route to international prosperity. Countries were to avoid resort to restrictions on trade and current payments. But they were quite free to control capital movements. Indeed Keynes suggested at the time control of capital movements, both inward and outward, should be a permanent feature of the post-war system.' This attitude toward capital movements was, of course, strongly influenced by the disorderly experience of the inter-war years when capital movements in the form of hot money flows were a disruptive and destabilizing force. Capital controls did not, in fact, become a permanent feature of the arrangements, but what is interesting is that in the Bretton Woods system, freedom of capital movement was not thought necessary to national and international prosperity. In the post-war period, international investment, especially direct investment, has grown at a phenomenal clip, faster than world trade, which itself has been growing faster than world income. A few numbers give the picture. The book value of US. direct investments worldwide increased almost fivefold from about $12 billion in I950 to perhaps $60 billion now. U.S. direct investment in Europe increased more than tenfold. The annual output of these overseas enterprises is about $120 billion. This compares with US. export sales of some $30 billion. American foreign investment has accounted for the largest flows, but businesses in other countries have also made appreciable foreign investments. Much international trade is now trade between parent company and affiliate, and increasingly foreign investment is a substitute for foreign trade. One can speculate whether, were the Bretton Woods Conference held today, the rules would be written differently, i.e., to protect the free flow of capital as well as of current items. It was not from any lack of appreciation of the contribution to the U.S. balance of payments and to the growth of the world economy made by foreign direct investments that the voluntary guidelines and the mandatory restraints were adopted. Nor