After several catastrophes wars, the Bretton Woods agreement has appeared. The countries which signed the treaty agreed to maintain the domestic currency to US dollar exchange rate, as well as the necessity of the corresponding ratio of the gold, and only allow a small fluctuation. Countries are prohibited to depreciate the currency value for the gain trade benefit, only allows the country to depreciate not more then 10%. Enters the 50's, the continuous growth of the international trade causes the fund large-scale shift which produces because of the postwar reconstruction, this causes Bretton Woods system which establishes the foreign exchange rate to lose stability.
This agreement was finally abolished in 1971, US dollar no longer could convert to gold. Until 1973, each major industrialized nation currency exchange rate fluctuation has been more freely, mainly regulates by the foreign exchange market through the currency supplies and demand quantity. The business volume, the transaction speed as well as the price variability, have achieved a comprehensive growth in the 1970's, come along with the emerge of price ratio fluctuation, the brand-new financial tool, then only the market liberalization and the trade liberalization could be achieved.
In the 1980s, along with the published of the computer and correlation technology, the international capital has flow rapidly, and strongly related the Asia, Europe and America market. Foreign exchange business volume from 80's rises daily from 70 billion US dollars to 150 billion US dollars after 20 years.