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FACTBOX - After the 'flash crash,' changes to U.S. markets
Why are the markets tumbling?
Global stock markets tumbled Monday on the first trading day since Standard & Poor's downgraded long-term US debt. The plunge came as investors grew anxious over a weakening US economy and a widening debt crisis in Europe.Not everything went as expected. Some analysts had worried that Treasury yields would surge after S&P's downgrade. That would happen if investors demanded higher returns to compensate