biggest weekly wall st gain since march 2009

It was the fourth time this week that the Dow gained more than 100 points. The Dow's 648 point gain for the week is its largest since the bull market began in March 2009. It is up 8.7 percent for the year, about 2 percent below its April high. The S&P is up 6.5 percent for the year. It had been up as high as 8.4 percent.

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