美国经济2011年四个季度环比的增长年率分别为0.4%、1.2%、1.8%和3.0%,增长步伐虽然差强人意,但其不断改善的趋势与受主权债务危机困扰的欧洲经济每况愈下的情况刚好相反。劳工市场和楼市被视为美国经济两大软肋,目前楼市无论是交投、建造及价格尚在低位徘徊,但劳工市场持续出现了非农业职位增长和失业 The U.S. economy grew 0.4%, 1.2%, 1.8% and 3.0% MoM respectively for the four quarters of 2011. Although the pace of growth is unsatisfactory, its continuous improvement trend is in the opposite direction to the deteriorating European economy plagued by the sovereign debt crisis . The labor market and the property market are seen as two major weaknesses in the U.S. economy. At present, the property market is trading, building and the prices are still hovering at a low level. However, the labor market continues to witness non-agricultural job growth and unemployment