20世纪80年代末以来，美国国会、政府监管部门、学术界以及会计职业界对企业报告普遍表示不满，认为企业财务报告没有能够象期望的那样提供有价值的信息。经验研究表明，企业的股票价格与主要财务变量，如收益、账面价值或现金流之间的统计关系越来越弱，结果使得依据会计信息 Since the late 1980s, the US Congress, government regulators, academics and accounting professionals have generally expressed dissatisfaction with corporate reports, claiming that corporate financial reports have not been able to provide valuable information as expected. Empirical studies show that the statistical relationship between the stock price of an enterprise and its major financial variables, such as earnings, book value or cash flow, is getting weaker and weaker. As a result,