Gold is a currency. Gold as a currency in a very long history, unearthed in ancient Alexandria, Rome 2300 years have elapsed since the gold, Persian gold coins have been 2500 years of history. The earliest existing Chinese coins are the Spring and Autumn when casting Chu's "Ying love", since others also have 2300 years of history. However, these coins only at a certain range, the region of the coins in circulation. Gold has become a world-recognized international currency are emerging in the nineteenth century "gold standard" period. "Gold standard" that gold can serve as a domestic means of payment for the circulation of clearing; can be used as an international hard currency of foreign trade settlement. Although early in 1717 at the United Kingdom first introduced the gold standard, but it was not until 1816 it was formally identified in the system given. After Germany, Sweden, Norway, the Netherlands, the United States, France, Russia, Japan and other countries have announced the implementation of the gold standard. Gold standard gold currency are property of peak performance. The implementation of the gold standard around the world more than 200 elderly people, the shorter a few decades, while China has always been the gold standard does not apply. Because after the outbreak of World War II, countries have gold control, difficult to maintain the gold standard. On the eve of the Second World War, in the United States under the guidance of the Bretton Woods Conference convened by the relevant resolutions and decisions in order to set up dollar-centered international monetary system, but linked to the dollar and gold, the United States commitment to take up the dollar by 35 1 ounces Gold's international obligations.
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