(Bloomberg) -- U.S. stocks rallied the most since 2011, halting a six-day rout, as investors found some relief after the worst global equity rout in almost four years. Treasuries fell and the dollar rose.

The S&P 500 jumped 3.9% amid a second day of dramatic swings in equity markets, succeeding where a rally yesterday failed in the final hours of trading. Two things that have supported U.S. stocks in the past, dovish words from the Federal Reserve and improving economic data, halted a plunge that erased $2.2 trillion from share values. 

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