The International Monetary Fund said Tuesday it's shaving off some of its earlier optimism about world economic growth over the next couple years. It has downgraded its growth forecast for this year from 3.9 percent to 3.7 percent, and for next year, the IMF has ticked the world's growth down from 2.7 percent to 2.5 percent. The forecast took some of the wind out of U.S. and Chinese economic expansion, too, saying both countries would grow more slowly than previously thought. So what could be dragging us down in a year's time?
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