An exchange rate is the rate at which one currency may be traded (bought or sold) for another currency. Normally it is more expensive to buy another currency than it is to sell that currency. This differential is referred to as the "spread" and the difference between the buy rate and the sell rate is referred to as the "mid rate".
Unlike gold fixing exchange rate fixing or forex fixing does not have a universal method to globally stabilize the exchange rates.
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Market capitalization/capitalisation (often market cap) is a measurement of size of a business enterprise (corporation) equal to the share price times the number of shares outstanding (shares that have been authorized, issued, and purchased by investors) of a publicly traded company. As owning stock represents ownership of the company, including all its equity, capitalization could represent the public opinion of a company's net worth and is a determining factor in stock valuation. Likewise, the capitalization of stock markets or economic regions may be compared to other economic indicators. The total market capitalization of all publicly traded companies in the world was US$51.2 trillion in January 2007 and rose as high as US$57.5 trillion in May 2008 before dropping below US$50 trillion in August 2008 and slightly above US$40 trillion in September 2008.
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