２００１年以来，世界经济形势相当严峻，西方发达国家经济普遍低迷，特别是美国发生“９·１１”被袭事件使世界经济雪上加霜。据初步估计，“９·１１”事件对美国经济的影响非常严重，直接损失将高达８００亿美元，使美国经济增长进一步放缓，许多大公司盈利减少，大量裁员 Since 2001, the world economic situation has been rather harsh, and the economy in the western developed countries has been generally sluggish. In particular, the U.S. attack on September 11 has worsened the world economy. According to preliminary estimates, the “9.11” incident has had a serious impact on the U.S. economy with a direct loss of up to 80 billion U.S. dollars, a further slowdown in U.S. economic growth, a reduction in profits of many large companies and massive redundancies