Imam Hossein University Budget and Finance Strategic Research 2717-1809 3 1 2022 06 22 Investigating the Relationship between Competition in Industry and Audit Rights with the Emphasis on Auditor Specialist in Industry and Size Audit Institute Investigating the Relationship between Competition in Industry and Audit Rights with the Emphasis on Auditor Specialist in Industry and Size Audit Institute 69 45 207328 FA Armin Vojoudi Nobakht Corresponding Author, Ph.D. in Accounting, Imam Khomeini International University،Tehran،Iran 0000-0003-2294-4494 Hamid Hagheghat Associate Professor, Imam Khomeini International University،Tehran،Iran 0000-0003-2909-5560 Mehdi Yahyaie Sahzabi MA in Program and Budget Management, Imam Hussein University،Tehran،Iran 0009-0005-3027-4277 Journal Article 2022 01 13 The purpose of this study is to investigate the effect of audit's expertise and audit size on the relationship between industry and audit fees. Competition in the market as a control mechanism can lead to reduced dealership costs and audit fees. On the other hand, expert auditors and large auditors with greater knowledge and experience can affect the relationship between market competition and audit fees. To test the research hypotheses of 152 companies listed in Tehran Stock Exchange and 931 observation were collected during the years 2015 to 1399; Combined regression analysis was also used for statistical tests. The results of the hypotheses test showed that there was a significant and reverse audit between competition in the industry and the audit, and the auditor's expertise in the industry and the size of the audit institute leads to an increasing adjustment of the relationship between competition in industry and audit fees. The purpose of this study is to investigate the effect of audit's expertise and audit size on the relationship between industry and audit fees. Competition in the market as a control mechanism can lead to reduced dealership costs and audit fees. On the other hand, expert auditors and large auditors with greater knowledge and experience can affect the relationship between market competition and audit fees. To test the research hypotheses of 152 companies listed in Tehran Stock Exchange and 931 observation were collected during the years 2015 to 1399; Combined regression analysis was also used for statistical tests. The results of the hypotheses test showed that there was a significant and reverse audit between competition in the industry and the audit, and the auditor's expertise in the industry and the size of the audit institute leads to an increasing adjustment of the relationship between competition in industry and audit fees. https://fbarj.ihu.ac.ir/article_207328_e2ce84fd1f8114de398352faed2bc256.pdf