A stock market or equity market is a public (a loose network of economic transactions, not a physical facility or discrete) entity for the trading of company stock (shares) and derivatives at an agreed price; these are securities listed on a stock exchange as well as those only traded privately. The size of the world stock market was estimated at about $36.6 trillion at the start of October 2008. The total world derivatives market has been estimated at about $791 trillion face or nominal value, 11 times the size of the entire world economy. The value of the derivatives market, because it is stated in terms of notional values, cannot be directly compared to a stock or a fixed income security, which traditionally refers to an actual value. Moreover, the vast majority of derivatives cancel each other out (i.e., a derivative bet on an event occurring is offset by a comparable derivative
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