One problem in forecasting earnings, he says, is that the Internet and real-estate bubbles pushed corporate profit margins to 7%, above the historical level of 6%.

他说，预测收益时存在的一个问题是，互联网和房地产泡沫将公司利润率推高到7%，超过了6%的历史水平。

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As for Mr Bernanke, the Fed is forecasting growth of 3.4%-3.9% this year, a rate above the historical trend.

至于伯纳克，美联储预计在今年实现3.4% - 3.9%的增长，这个数字高于历史的趋势。

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Forecasting - Analyze and predict future outcomes based on historical patterns.

基于对历史的模式预测-分析和预测未来的结果。

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They use a forecasting model that relies, in particular, on the close historical relationship between company profits and two variables, total corporate investment in equipment and the commodity-price index published by The Economist.

ECONOMIST: American shares