Direct Measurement of Supplier Concentration in the Market for Audit Services.
利用美国会计师事务所的实际审计收入直接测量审计市场集中度，发现市场高度集中，但集中度低于以往基于代理变量的研究结果。
Abstract In this paper, auditor concentration in the United States is measured directly using actual audit revenues of public accounting firms. Direct measurement can reduce the bias that is generally present in concentration ratios that are based on surrogates for audit fees and yields measures that can be compared more reliably with ratios for other industries. Direct measures also can be used to make more reliable international comparisons of auditor concentration. Concentration measures for the years 1983 through 1987 that were computed from revenues of the 28 largest CPA firms indicate that the U.S. market for audit services is quite concentrated. Nonetheless, the ratios reported in this study are lower than the ratios reported in most of the prior studies on concentration that relied on various surrogates for audit fees.