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Dollar Rally Spurs Commodity Slide as S&P 500 Returns to Record

The Dollar Index extended its biggest two-day rally since July, helping trigger a plunge in commodities, and Treasuries tumbled amid improving confidence in the strength of the American economy. U.S. stocks advanced, returning benchmark indexes to all-time highs.

The Dollar Index, a gauge of the currency against six major peers, added 0.4 percent to 83.15 to extend its two-day gain to