The world is still a closed economy, but its regions and countries are becoming increasingly open. The trend, which has been manifested in both freer movement of goods and increased mobility of capital, has been stimulated by the dismantling of trade and exchange controls in Europe, the gradual erosion of the real burden of tariff protection, and the stability, unparalleled since 1914, of the exchange rates. The international economic climate has changed in the direction of financial integration and this has important implications for economic policy.My paper concerns the theoretical and practical implications of the increased mobility of capital. In order to present my conclusions in the simplest possible way, and to bring the implications for policy into sharpest relief, I assume the extreme degree of mobility that prevails when a country cannot maintain an interest rate different from the general level prevailing abroad. This assumption will overstate the case but it has the merit of posing a stereotype towards which international financial relations seem to be heading. At the same time it might be argued that the assumption is not far from the truth in those financial centres, of which Zurich, Amsterdam, and Brussels may be taken as examples, where the authorities already recognize their lessening ability to dominate money market conditions and insulate them from foreign influences. It should also have a high degree of relevance to a country like Canada whose financial markets are dominated to a great degree by the vast New York market.

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The following paper was prepared at the invitation of Cambridge University by the American Ambassador to Great Britain and delivered in the Senate House .... The University authorities named the subject. The Ambassador said at the time he never should have chosen it for that audience, but when it was chosen for him he was unwilling to run from it ... .