NEW YORK—Gold and other commodities surged Monday, buoyed by a weakening dollar and a rally on Wall Street that lifted the Dow Jones industrials nearly 400 points.

The dollar fell against the euro and the British pound after the government unveiled a plan to rescue Citigroup Inc. The bailout plan could lead to the Treasury’s issuing more bonds to fund the plan, and that in turn could feed inflation, which undermines the dollar. Investors often use commodities as a hedge against inflation, so a falling dollar tends to lift prices.

“The government bailout is certainly goi...

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