中国经济今年超美国?

　　国际货币基金组织(IMF)有一项预测显示，中国的经济规模今年将超越美国。这项预测的统计方法是基于各国购买力平价(PPP)来计算国民生产总值(GDP)的。但这里也存在一个理论汇率和现实汇率的问题，其准确性存在争议。 按照其他算法预测，近10年，美国还将依然引领世界经济。

　　1.2 percent: Margin by which the size of China’s economy will surpass that of the U.S. for the first time in 2014, according to one International Monetary Fund projection. The IMF was measuring each country’s GDP at purchasing power parity, which, as Bloomberg defined it, “uses exchange rates that adjust for price differences of the same goods between nations.” By other measures, the U.S. will lead the pack of the world’s economies for perhaps another decade.