This is a developing story about the final reading of U.S. first-quarter GDP. Please check back for updates. The U.S. economy grew at a faster pace than expected in the first quarter, according to the Commerce Department's estimate.The Bureau of Economic Analysis (BEA) on Thursday released its final reading of first-quarter GDP, which showed the economy grew at an annualized rate of 2.1% in the three-month period including January, February and March.  That figure was higher than the expectations of economi ...