The U.S. stock market ended Monday's choppy trading session marginally higher. The main benchmarks dipped in and out of negative territory as investors weighed upbeat economic reports and deal news against concerns over escalating sectarian violence in Iraq. Investors favored utilities and energy stocks, while financials and materials were shunned. The S&P 500 closed 1.62 points, or 0.1%, higher at 1,937.78. The Dow Jones Industrial Average added 5.27 points to 16,781.01. The Nasdaq Composite ended the day up 10.45 points, or 0.2% at 4,321.11.

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