عنوان مقاله [English]
The study is aimed to investigate the relation of audit market concentration to audit fee and audit quality. The sample consists of 91 firms listed in Tehran Stock Exchange for a period of 10 years from 2004 to 2014. The study uses panel regression model to test the first and third hypotheses and employs Chao and Hausman tests to select among hybrid, fixed effects and random effects models. Also it uses Panel logistic regression model to test the second and fourth hypotheses and applies AIC statistic to choose the appropriate logistic regression model. Results indicate that there is a significant positive relation between audit market concentration and audit fee, while there is no significant relation between audit market concentration and audit quality. In addition, findings indicate that despite of increases in market concentration after approval of Article 99 of the Fifth Development Plan, this approval has no effects on the relation of the audit market concentration to auditor fees and quality audit.
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