Concentration without differentiation: A new look at the determinants of audit market concentration
用一个无差异价格竞争模型准确预测了美国审计市场集中度，发现合同实践、客户规模分布和审计师生产率差异共同决定了市场份额，而质量差异和规模经济并非必要解释因素。
We show that a model of undifferentiated price competition closely predicts US audit market concentration. Contracting practices, client size distributions and differences in auditor productivity jointly determine audit firms' market shares. In contrast to prior literature, neither quality differences nor economies of scale for larger firms are necessary in our model to explain audit market concentration.