Stocks opened slightly higher open on Monday, buoyed by better-than-expected earnings from Citigroup. The bank was helped by a smaller loss on its troubled assets. In other headlines, retail sales jumped 1.1% in March, surpassing economists' expectations and reaching the biggest monthly gain since September 2012. Also, Glencore Xstrata sells its interest in one of its largest mines to a Chinese consortium and GlaxoSmithKline is facing criminal investigations of bribery in Poland.
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