近期,美国经济增长大幅减慢的态势令人不安:美元汇率大幅波动;股市新低不断出现;经济增长减速;套利者、贸易者和投资者市场行为的合作竞争,瞬息万变,金融市场活动的参与者(个人、金融机构、证券公司和政府机构等)皆在趋利避害。它同时在给世界经济增长带来严重影响:造 Recently, the sharp slowdown in U.S. economic growth is disturbing: the exchange rate of the U.S. dollar has fluctuated sharply; the new low of the stock market has emerged; the economic growth has slowed down; the cooperation and competition of arbitrageurs, traders and investors in market behavior have been rapidly changing. Participants in financial market activities (Individuals, financial institutions, securities companies and government agencies, etc.) are trying to avoid disadvantages. It also has a serious impact on the world economic growth at the same time