A bidding contest for a discount retailer and easing concerns about Ukraine helped send U.S. stock indexes higher.
The Dow Jones industrial average rose 175 points, or 1.1 percent, to close at 16,838 Monday.
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The Standard & Poor's 500 index rose 16 points, or 0.9 percent, to 1,971.
The Nasdaq composite gained 43 points, or 1 percent, to 4,508.
Dollar General jumped 12 percent after the company made a bid to buy Family Dollar. The company is hoping to beat out a rival bid from Dollar Tree.
Airline stocks rose as the price of oil fell, which could mean lower costs for jet fuel. United Continental and American Airlines each climbed 4 percent.
Bond prices fell. The yield on the 10-year Treasury note rose to 2.39 percent.