
Over the past few weeks the global financial market volatility, market concerns about European banks financing capability, the U.S. debt ceiling and the Standard & Poor's downgraded its sovereign rating outlook for economic recovery become more negative, the concentration of risk aversion caused by the outbreak. Markets also play a role in its own laws, after all, began in March 2009, S & P 500 index rose twice, most commodities increase even more impressive than this, ...The probability of extreme events is not high
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