Competition in an Audit Segmented Market: Evidence from the Nigerian Listed Non-Financial Firms
Abstract
The study examines the effect of competition on audit price and quality. We measure competition using initial audit price, static, and dynamic competition indicators. Static competition is measured using audit concentration, while the dynamic competition is measured using client mobility. The study fills in the gap in the literature by examining audit competition in a segmented audit market, considering audit complexity, and separating the Nigerian non-financial institution audit market into oligopolistic and atomistic segments. Our study employs ordinary least squares to analyse the data collected. The results show that audit concentration positively affects audit fees and improves quality in both segments. The study indicates that client mobility positively affects audit fees in both fragmented markets and provides evidence that audit clients react to low quality competitively by switching auditors within the segments. Finally, our results show that audit firms engage in lowball practices in the initial audit year as a marketing strategy, and initial year audit fee discounting improves audit quality. Our study provides evidence of competition within an audit-segmented market when the basis of delineation is audit complexity. Our results provide empirical evidence of audit competition in the oligopolistic segment, contrary to the traditional view of Structure Conduct Performance (SCP).
References
[1] Ajaegbu, C.O. (2012). Case for joint audit. Institute of Chartered Accountants of Nigeria, Lagos., pp 1-3. Available at: https://icanig.org/ican/documents/ICAN__CASE_FOR_JOINT_AUDIT_FINAL.pdf.
[2] Ascher, B. (2008). The Audit Industry: World's Weakest Oligopoly? Available at SSRN 1337105. DOI:10.2139/ssrn.1337105
[3] Asien, E. N. (2014). Exploring the state of the audit market in Nigeria. African Journal of Accounting, Auditing, and Finance, 3(4): 287-307. DOI: 10.1504/AJAAF.2014.069846
[4] Asthana, S., Khurana, I., & Raman, K. K. (2018). Fee Competition among Big 4 Auditors and Audit Quality. Review of Quantitative Finance and Accounting. DOI: 10.1007/s11156-018-0714-9
[5] Ayoola, T. J., Inneh, E. G., Obokoh, L. O., Kolawole, P. E. & Adeoye, E. T. (2022). Competition and efficiency in an Oligopolistic Audit market: Evidence from the Nigerian Banking Industry. Banks and Bank Systems, 17(4): 129-139. DOI: 10.21511/bbs.17(4).2022.11
[6] Azizkhani, M., Sami, H., Amirkhani, K., & Monroe, G. S. (2022). Competition Effects on Audit Quality and Pricing in A Non-Big 4 Market. The International Journal of Accounting, 57(04). DOI:10.1142/S1094406022500159
[7] Baldwin, J. R., & Gorecki, P. K. (1998). The Dynamics of Industrial Competition: A North American Perspective. Cambridge: Cambridge University Press.
[8] Ball, R., & Shivakumar, L. (2006). The role of accruals in asymmetrically timely gain and loss recognition. Journal of accounting research, 44(2), 207-242. DOI: 10.1111/j.1475-679X.2006.00198.x
[9] Barua, A., Lennox, C., & Raghunandan, A. (2020). Are Audit Fees Discounted in Initial Year Audit Engagements? Journal of Accounting and Economics, 69(2-3). DOI: 10.1016/j.jacceco.2019.101282
[10] Boone, J. P., Khurana, I. K., & Raman, K. K. (2012). Audit market concentration and auditor tolerance for earnings management. Contemporary Accounting Research, 29(4): 1171-1203.
[11] Buijink, W. F., Maijoor, S. J., & Meuwissen, R. H. (1998). Competition in auditing: Evidence from entry, exit, and market share mobility in Germany versus The Netherlands. Contemporary Accounting Research, 15(3): 385-404. DOI: 10.1111/j.1911-3846.1998.tb00565.x
[12] Cabral, L. (2017). Introduction to Industrial Organization (2 ed.). MIT Press, Cambridge.
[13] Carlton, D. W., & Perloff, J. (1994). Modern Industrial Economics. Second Edition. Harper Collins: New York.
[14] Cassell, C. A., Hansen, J. C., Myers, L. A., & Seidel, T. A. (2020). Does The Timing of Auditor Changes Affect Audit Quality? Evidence from the initial year of the audit engagement. Journal of Accounting, Auditing & Finance, 35(2): 263-289. DOI: 10.1177/0148558X17726241
[15] Chan, D. K. (1999). "Lowballing" and efficiency in a two‐period specialisation model of auditing competition. Contemporary Accounting Research, 16(4): 609-642. DOI: 10.1111/j.1911-3846.1999.tb00598.x
[16] Chen, J. Z., Elemes, A., & Lobo, G. J. (2023). David versus Goliath: The relation between auditor size and audit quality for UK private firms. European Accounting Review, 32(2): 447-480. DOI:10.1080/09638180.2021.1986090
[17] Cho, M., Kwon, S. Y., & Krishnan, G. V. (2021). Audit fee lowballing: Determinants, recovery, and future audit quality. Journal of Accounting and Public Policy, 40(4). DOI: 10.1016/j.jaccpubpol.2020.106787
[18] Chung, H., & Lee, E. Y. (2024). Does opinion shopping impair auditor independence? Evidence from tax avoidance. Journal of Contemporary Accounting & Economics, 20(1). DOI: 10.1016/j.jcae.2023.100398
[19] Ciconte, W., Knechel, W. R., and Schelleman, C. (2015). An examination of the relation between market structure and the profitability of audit engagements. Accounting and finance, 55(3). DOI: 10.1111/acfi.12078
[20] Craswell, A. T., & Francis, J. R. (1999). Pricing initial audit engagements: A test of competing theories. The Accounting Review, 74(2): 201-216. DOI: 10.2308/accr.1999.74.2.201
[21] Day, C. J., Hobbs, B. F., & Pang, J. S. (2002). Oligopolistic competition in power networks: a conjectured supply function approach. IEEE Transactions on power systems, 17(3). DOI: 10.1109/TPWRS.2002.800900
[22] Deangelo, L. E. (1981). Auditor Independence, 'Low Balling,' and Disclosure Regulation. Journal of Accounting and Economics, 3 (2): 113–127. DOI: 10.1016/0165-4101(81)90009-4
[23] Dechow, P. M., Sloan, R. G., & Sweeney, A. P. (1995). Detecting earnings management. Accounting review, 193-225. Available at: https://www.jstor.org/stable/248303
[24] Dekeyser, S., Gaeremynck, A., Knechel, W. R., & Willekens, M. (2021). Multimarket contact and mutual forbearance in audit markets. Journal of accounting research, 59(5). DOI: 10.1111/1475-679X.12406
[25] Desir, R., Casterella, J. R., and Kokina, J. (2014.). A Reexamination of Audit Fees for Initial Audit Engagements in the Post-SOX Period. Auditing: A Journal of Practice and Theory, 33(2): 59-78. DOI:10.2308/ajpt-50670.
[26] Dey, M. R. (2010). The effect of client industry structure on client preference for privacy and auditor concentration. Managerial Auditing Journal, 25(4): 361-376. DOI: 10.1108/02686901011034171
[27] Dey, R. M. (2013). Client Demand for Privacy and Audit Fees. The BRC Academy Journal of Business, 3(1): 61-81. https://www.cambriainstitute.com/journals/acadb149v3n1y2013f61.pdf.
[28] Dunn, K., Kohlbeck, M. J., & Mayhew, B. W. (2008). The Impact of Big N Public Accounting Firm Consolidation on Auditor Industry Concentration. Available at SSRN 1178182. DOI: 10.2139/ssrn.1178182
[29] Dye, R. A. (1991). Informationally Motivated Auditor Replacement. Journal of Accounting and Economics, 14(4): 347-374. DOI: 10.1016/0165-4101(91)90008-C
[30] Eguasa, B. E., and Urhoghide, O. R. (2017). Audit Market Concentration and Audit Quality in Nigeria. IOSR Journal of Business and Management, 19(9): 1-9. Retrieved from www.iosrjournals.org
[31] Elayan, F. A., Brown, K., Pacharn, P., Chen, Y., & Li, J. (2024). Auditee Merger, Audit Fees, and the Market Dominance of Big Four Accounting Firms. Audit Fees, and the Market Dominance of Big Four Accounting Firms. DOI: 10.2139/ssrn.4700711
[32] Elbardan, H., Kotb, A., & Ishaque, M. (2023). A Review of the Empirical Literature on Audit Market Concentration. The International Journal of Accounting, 2350006. DOI: 10.1142/S1094406023500063.
[33] Eshelman, J. D., and Lawson, B. P. (2017). Audit Market Structure and Audit Pricing. Account. Horizons, 31 (1): 57–81. DOI: 10.2308/acch-51603.
[34] Etro, F. (2014). The Theory of Endogenous Market Structures. Journal of Economic Surveys, 28: 804–830. DOI: 10.1111/joes.12020.
[35] Ettredge, M., & Greenberg, R. (1990). Determinants of fee-cutting on initial audit engagements. Journal of accounting research, 28(1): 198-210. DOI: 10.2307/2491224.
[36] Francis, J. R., Michas, P. N., & Seavey, S. E. (2013). Does Audit Market Concentration Harm the Quality of Audited Earnings? Evidence from Audit Markets in 42 Countries. Contemporary Accounting Research, 30(1): 325-355. DOI: 10.1111/j.1911-3846.2012.01156.x.
[37] Ghosh, A., & Pawlewicz, R. (2009). The impact of Regulation on Auditor Fees: Evidence from the Sarbanes-Oxley Act. Audit.: A J. Pract. Theory, 23 (2): 67–78. DOI: 10.2308/aud.2009.28.2.171
[38] Ghosh, A., and Lustgarten, S. (2006). Pricing of Initial Audit Engagements by Large and Small Audit Firms. Contemporary Accounting Research, 23(2): 333–368. DOI: 10.1506/927U-JGJY-35TA-7NT1
[39] Gunn, J. L., Kawada, B. S., & Michas, P. N. (2019). Audit Market Concentration, Audit Fees, and Audit Quality: A Cross-Country Analysis of Complex Audit Clients. Journal of Accounting and Public Policy, 38(6). DOI: 10.1016/j.jaccpubpol.2019.106693
[40] Guo, Q., Koch, C., & Zhu, A. (2017). Joint Audit, Audit Market Structure, and Consumer Surplus. Review of Accounting Studies, 22: 1595-1627. DOI: 10.1007/s11142-017-9429-8
[41] Hay, D. A., & Liu, G. S. (1997). The efficiency of firms: what difference does competition make? The Economic Journal, 107(442): 597-617. DOI: 10.1111/j.1468-0297.1997.tb00029.x
[42] Hay, D. C., Knechel, W. R., & Wong, N. (2006). Audit fees: A meta‐analysis of the effect of supply and demand attributes. Contemporary accounting research, 23(1). DOI: 10.1506/4XR4-KT5V-E8CN-91GX
[43] Huang, H. W., Raghunandan, K., Huang, T. C., & Chiou, J. R. (2015). Fee discounting and audit quality following audit firm and audit partner changes: Chinese evidence. The Accounting Review, 90(4): 1517-1546. DOI: 10.2308/accr-50958
[44] Huang, T. C., Chang, H., & Chiou, J. R. (2016). Audit Market Concentration, Audit Fees, and Audit Quality: Evidence from China. Auditing: J. Practice Theory, 35 (2): 121–145. DOI: 10.2308/ajpt-51299
[45] Jeter, D. C., & Shivakumar, L. (1999). Cross-sectional estimation of abnormal accruals using quarterly and annual data: Effectiveness in detecting event-specific earnings management. Accounting and Business Research, 29(4): 299-319. DOI: 10.1080/00014788.1999.9729590
[46] Kacer, M., Duboisée De Ricquebourg, A., Peel, M. J., & Wilson, N. (2023). Audit market measures in audit pricing studies: The issue of mechanical correlation. European Accounting Review, 1-33. DOI:10.1080/09638180.2023.2214169
[47] Kallapur, S., Greenberg, S., & Zang, Y. (2010). Audit Market Competition and Audit Quality. Indian School of Business Gachibowli, Hyderabad, 500032, 1-55. DOI: 10.2139/ssrn.1546356
[48] Kamolane, P., & Odendaal, E. (2021). Audit Market Concentration within the South African Listed Market: An Industry Perspective. Southern African Journal of Accountability and Auditing Research, 23(1): 77-96. DOI:10.54483/sajaar.2021.23.1.6.
[49] Kim, S., Cho, H., Cho, M., Lee, B. B. H., & Lee, W. J. (2024). Flexible CPA staffing in non‐Big 4 audit firms: Its determinants and implications for audit fees and audit quality. International Journal of Auditing, 28(2): 364-387. DOI: 10.1111/ijau.12335
[50] Kitto, A. R. (2024). The effects of non-Big 4 mergers on audit efficiency and audit market competition☆. Journal of Accounting and Economics, 77(1), 101618. DOI: 10.1016/j.jacceco.2023.101618
[51] Krishnan, G. V., and Tanyi, P. (2020). Does Regulating Audit Pricing Enhance Audit Quality and the Timeliness of Audit Reporting? The Texas Experience. Journal of Law, Finance, and Accounting, 5(1): 1-64. DOI: 10.1561/108.00000040
[52] Liu, W. P., & Huang, H. W. (2024). Internal control opinion shopping: Does initial audit fee discounting matter? Research in International Business and Finance, 69, 102248. DOI: 10.1016/j.ribaf.2024.102248
[53] López, D. M., & Peters, G. F. (2011). Auditor workload compression and busy season auditor switching. Accounting Horizons, 25(2): 357–380. DOI: 10.2308/acch-10026
[54] Marrian, I., & Pong, C. (2007). Competitiveness. of the Audit Services Market. Managerial Auditing Journal, 22(2). DOI: 10.1108/maj.2007.05122baa.001
[55] Ndubuisi, O., Henry, W. O., & Horsfall, F. V. F. (2025). Firm Attributes and Share Price of Quoted Firms in Nigeria: Analysis of Investors' Evaluations of Financial and Non-Financial Sectors. Research Journal of Management Practice| ISSN, 2782, 7674.
[56] Newton, N. J., Wang, D., & Wilkins, M. S. (2013). Does A Lack of Choice Lead to Lower Quality? Evidence from Auditor Competition and Client Restatements. Auditing: A Journal of Practice & Theory, 32(3): 31-67. DOI: 10.2308/ajpt-50461
[57] Ng, H. Y., Tronnes, P. C., & Wong, L. (2018). Audit Seasonality and Pricing of Audit Services: Theory and evidence from a meta-analysis. Journal of Accounting Literature, 40(1): 16-28. DOI:10.1016/j.acclit.2017.11.003
[58] Nicholson, W., & Snyder, C. (2008). Microeconomic Theory: Basic Principles and Extensions (Tenth). Thomson Higher Education, Mason, OH.
[59] Noll, R. G. (2004). Buyer power and economic policy. Antitrust LJ, 72, 589.
[60] Numan, W., & Willekens, M. (2012). An Empirical Test of Spatial Competition in the Audit Market. Journal of Accounting and Economics, 53(1): 450-465. DOI: 10.1016/j.jacceco.2011.10.002
[61] Nwosu, C. (2023). Exploring the effectiveness of anti-corruption laws in Nigeria: a comparative study of legal frameworks and practical outcomes. American Journal of Law and Political Science, 2(1): 67-75. DOI:10.58425/ajlps.v2i1.153
[62] Ogbe, H. E., & Oyibokure, G. I. (2023). Impact assessment of the COVID-19 pandemic and the Nigerian judicial system. Social Science Research, 9(1): 19-36. Available at: https://journals.aphriapub.com/index.php/SSR/article/view/2046/1898
[63] Okaro, S. C. & Okafor, G. O. (2013). Audit Market Concentration In Nigeria: An Empirical Study. Available at: https://www.researchgate.net/publication/277728546_Audit_Market_Concentration-_An_Empirical_Study
[64] Pearson, T., & Trompeter, G. (1994). Competition in the Market for Audit Services: The Effect of Supplier Concentration on Audit Fee. Contemporary Accounting Research, 11(1): 115-135. DOI: 10.1111/j.1911-3846.1994.tb00439.x.
[65] Peel, M. J. (2013). The pricing of initial audit engagements by big 4 and leading mid-tier auditors. Accounting and Business Research, 43(6): 636-659. DOI: 10.1080/00014788.2013.827106
[66] Pilat, D. (1996). Competition, productivity and efficiency. OECD Economic Studies, 27(2): 107-46.
[67] Pindyck, R.S. & Rubinfeld, D. L. (2018), Microeconomics, Ninth Edition, Global Edition, Pearson, Harlow, England.
[68] Salifu, M., Peprah, J. A., & Cantah, W. G. (2024). Legal Systems, Property Rights, and Financial Development in Sub-Saharan Africa. SAGE Open, 14(2). DOI: 10.1177/21582440241257932.
[69] Scheidt, I. (2020). The Audit Oligopoly in the European Union: Quantitative Analysis on the Client Industry Structure for the Big Four Audit Firms in the European Union. Available at: https://www.diva-portal.org/smash/get/diva2:1512896/FULLTEXT01.pdf
[70] Simac, I., & Willekens, M. (2024). Competitive Strategies for Small Audit Firms. The International Journal of Accounting, 2450012. DOI: 10.1142/S1094406024500124.
[71] Simon, D. T., & Francis, J. R. (1988). The effects of auditor change on audit fees: Tests of price cutting and price recovery. Accounting Review, 255-269. Available at: https://www.jstor.org/stable/248104
[72] Simons, D., & Zein, N. (2016). Audit market segmentation–The impact of mid-tier firms on competition. European accounting review, 25(1): 131-154. DOI: 080/09638180.2014.990476
[73] Sirois, L. P., & Simunic, D. A. (2011). Auditor size and audit quality revisited: The importance of audit technology. Available at SSRN 1694613. Available at: https://www.cairn-int.info/revue-accounting-auditing-control-2016-3-page-111.htm&wt.src=pdf
[74] Soyemi, K. A., Oluwatuyi, A. O., & Adeyemi, O. A. (2025). Key Audit Matters Disclosure (KAMD), Audit Quality and Financial Reporting Quality of Quoted Non-financial Firms in Nigeria. AKSU Journal of Administration and Corporate Governance (AKSUJACOG), 5(1): 118-132.
[75] Stiglitz, J. (1987). Competition and the Number of Firms in a Market: are Duopolies More Competitive than Atomistic Markets. Journal of Political Economics, 95(5): 1041–1061.
[76] Sutton, J. (1991). Sunk Costs and Market Structure: Price Competition, Advertising, and the Evolution of Concentration. Cambridge, MA: MIT Press.
[77] Urhoghide, R. O., & Izedonmi, F. O. I. (2015). An empirical investigation of audit fee determinants in Nigeria. International Journal of Business and Social Research, 5(8): 48-58. Available at: https://thejournalofbusiness.org/index.php/site/article/view/785/547.
[78] Van Raak, J., Peek, E., Meuwissen, R., & Schelleman, C. (2020). The Effect of Audit Market Structure on Audit Quality and Audit Pricing in The Private‐Client Market. Journal of Business Finance & Accounting, 47(3-4): 456-488. DOI: 10.1111/jbfa.12414
[79] Willekens, M., Dekeyser, S., Bruynseels, L., & Numan, W. (2023). Auditor Market Power and Audit Quality Revisited: Effects of Market Concentration, Market Share Distance, and Leadership. Journal of Accounting, Auditing & Finance, 38(1): 161-181. DOI: 10.1177/0148558X20966249
[80] Xin, Q., Liu, Y., & Tang, Y. (2023). China's audit market competition and the competitive strategies of the international Big 4 audit firms. China Journal of Accounting Studies, 11(3): 574-601. DOI:10.1080/21697213.2023.2239675
[81] Zerni, M. (2012). Audit Partner Specialisation and Audit Fees: Some Evidence from Sweden. Contemporary Accounting Research, 29(1): 312-340. DOI: 10.1111/j.1911-3846.2011.01098.x
[82] Zhang, S. (2012). Surge in Audit Fees Leads to Complaints from Business Firms (in Chinese). Southern Daily News. Retrieved from http://epaper.nfdaily.cn/html/2012-07/20/content_7106019.htm.
[83] Companies and Allied Matters Act (2020).
[84] Competition & Markets Authority () (2019). Statutory audit services market study. London: competition & markets authority.
[85] Financial Reporting Council (FRC) (2018). Developments in audit. London: Financial Reporting Council. https://eaa-online.org/app/uploads/sites/3/2019/12/https__www.frc_.org_.uk_getattachment_5d176788-3330-4b62-b18e-276c678d3d2c_Developments-in-Audit-FINAL-05-Nov-2019.pdf.
[86] Financial Reporting Council of Nigeria (2011).
[87] GAO - General Accounting Office. (2008). Auditors of public companies. Continued concentration in audit market for large public companies does not call for immediate action.
[88] General Accounting Office. (2003). Public Accounting Firms: Mandated Study on Consolidation and Competition. Washington DC: GAO.
[89] IAB. (2013). A profession adapting to a changing world. International Accounting Bulletin, 521: 7–13.
[90] National Code of Corporate Governance (2016)
[91] National Code of Corporate Governance (2018)
[92] Oxera. (2006). Competition and Choice in the UK Audit Market: Prepared for the Department of Trade and Industry and Financial Reporting Council. Oxera Consulting (Oxford. UK).
[93] Oxera. (2007). Ownership Rules of Audit Firms and their Consequences for Audit Market Concentration. England.
[94] Pwc, (2012). Submission and Response to Issues Statement: Pricewaterhouse Coopers LLP. London: Competition Commission. Available at: http://www.competition-commission.org.uk/assets/competitioncommission/docs/2011/statutory-auditservices/pwc_response_to_is_non_confidentialversion.pdf
[95] United States Treasury. (2008). Advisory committee on the auditing profession: Final report, October 6, 2008. Available at: http://www.treas.gov/offices/domestic-finance/acap/docs/final-report.pdf
[2] Ascher, B. (2008). The Audit Industry: World's Weakest Oligopoly? Available at SSRN 1337105. DOI:10.2139/ssrn.1337105
[3] Asien, E. N. (2014). Exploring the state of the audit market in Nigeria. African Journal of Accounting, Auditing, and Finance, 3(4): 287-307. DOI: 10.1504/AJAAF.2014.069846
[4] Asthana, S., Khurana, I., & Raman, K. K. (2018). Fee Competition among Big 4 Auditors and Audit Quality. Review of Quantitative Finance and Accounting. DOI: 10.1007/s11156-018-0714-9
[5] Ayoola, T. J., Inneh, E. G., Obokoh, L. O., Kolawole, P. E. & Adeoye, E. T. (2022). Competition and efficiency in an Oligopolistic Audit market: Evidence from the Nigerian Banking Industry. Banks and Bank Systems, 17(4): 129-139. DOI: 10.21511/bbs.17(4).2022.11
[6] Azizkhani, M., Sami, H., Amirkhani, K., & Monroe, G. S. (2022). Competition Effects on Audit Quality and Pricing in A Non-Big 4 Market. The International Journal of Accounting, 57(04). DOI:10.1142/S1094406022500159
[7] Baldwin, J. R., & Gorecki, P. K. (1998). The Dynamics of Industrial Competition: A North American Perspective. Cambridge: Cambridge University Press.
[8] Ball, R., & Shivakumar, L. (2006). The role of accruals in asymmetrically timely gain and loss recognition. Journal of accounting research, 44(2), 207-242. DOI: 10.1111/j.1475-679X.2006.00198.x
[9] Barua, A., Lennox, C., & Raghunandan, A. (2020). Are Audit Fees Discounted in Initial Year Audit Engagements? Journal of Accounting and Economics, 69(2-3). DOI: 10.1016/j.jacceco.2019.101282
[10] Boone, J. P., Khurana, I. K., & Raman, K. K. (2012). Audit market concentration and auditor tolerance for earnings management. Contemporary Accounting Research, 29(4): 1171-1203.
[11] Buijink, W. F., Maijoor, S. J., & Meuwissen, R. H. (1998). Competition in auditing: Evidence from entry, exit, and market share mobility in Germany versus The Netherlands. Contemporary Accounting Research, 15(3): 385-404. DOI: 10.1111/j.1911-3846.1998.tb00565.x
[12] Cabral, L. (2017). Introduction to Industrial Organization (2 ed.). MIT Press, Cambridge.
[13] Carlton, D. W., & Perloff, J. (1994). Modern Industrial Economics. Second Edition. Harper Collins: New York.
[14] Cassell, C. A., Hansen, J. C., Myers, L. A., & Seidel, T. A. (2020). Does The Timing of Auditor Changes Affect Audit Quality? Evidence from the initial year of the audit engagement. Journal of Accounting, Auditing & Finance, 35(2): 263-289. DOI: 10.1177/0148558X17726241
[15] Chan, D. K. (1999). "Lowballing" and efficiency in a two‐period specialisation model of auditing competition. Contemporary Accounting Research, 16(4): 609-642. DOI: 10.1111/j.1911-3846.1999.tb00598.x
[16] Chen, J. Z., Elemes, A., & Lobo, G. J. (2023). David versus Goliath: The relation between auditor size and audit quality for UK private firms. European Accounting Review, 32(2): 447-480. DOI:10.1080/09638180.2021.1986090
[17] Cho, M., Kwon, S. Y., & Krishnan, G. V. (2021). Audit fee lowballing: Determinants, recovery, and future audit quality. Journal of Accounting and Public Policy, 40(4). DOI: 10.1016/j.jaccpubpol.2020.106787
[18] Chung, H., & Lee, E. Y. (2024). Does opinion shopping impair auditor independence? Evidence from tax avoidance. Journal of Contemporary Accounting & Economics, 20(1). DOI: 10.1016/j.jcae.2023.100398
[19] Ciconte, W., Knechel, W. R., and Schelleman, C. (2015). An examination of the relation between market structure and the profitability of audit engagements. Accounting and finance, 55(3). DOI: 10.1111/acfi.12078
[20] Craswell, A. T., & Francis, J. R. (1999). Pricing initial audit engagements: A test of competing theories. The Accounting Review, 74(2): 201-216. DOI: 10.2308/accr.1999.74.2.201
[21] Day, C. J., Hobbs, B. F., & Pang, J. S. (2002). Oligopolistic competition in power networks: a conjectured supply function approach. IEEE Transactions on power systems, 17(3). DOI: 10.1109/TPWRS.2002.800900
[22] Deangelo, L. E. (1981). Auditor Independence, 'Low Balling,' and Disclosure Regulation. Journal of Accounting and Economics, 3 (2): 113–127. DOI: 10.1016/0165-4101(81)90009-4
[23] Dechow, P. M., Sloan, R. G., & Sweeney, A. P. (1995). Detecting earnings management. Accounting review, 193-225. Available at: https://www.jstor.org/stable/248303
[24] Dekeyser, S., Gaeremynck, A., Knechel, W. R., & Willekens, M. (2021). Multimarket contact and mutual forbearance in audit markets. Journal of accounting research, 59(5). DOI: 10.1111/1475-679X.12406
[25] Desir, R., Casterella, J. R., and Kokina, J. (2014.). A Reexamination of Audit Fees for Initial Audit Engagements in the Post-SOX Period. Auditing: A Journal of Practice and Theory, 33(2): 59-78. DOI:10.2308/ajpt-50670.
[26] Dey, M. R. (2010). The effect of client industry structure on client preference for privacy and auditor concentration. Managerial Auditing Journal, 25(4): 361-376. DOI: 10.1108/02686901011034171
[27] Dey, R. M. (2013). Client Demand for Privacy and Audit Fees. The BRC Academy Journal of Business, 3(1): 61-81. https://www.cambriainstitute.com/journals/acadb149v3n1y2013f61.pdf.
[28] Dunn, K., Kohlbeck, M. J., & Mayhew, B. W. (2008). The Impact of Big N Public Accounting Firm Consolidation on Auditor Industry Concentration. Available at SSRN 1178182. DOI: 10.2139/ssrn.1178182
[29] Dye, R. A. (1991). Informationally Motivated Auditor Replacement. Journal of Accounting and Economics, 14(4): 347-374. DOI: 10.1016/0165-4101(91)90008-C
[30] Eguasa, B. E., and Urhoghide, O. R. (2017). Audit Market Concentration and Audit Quality in Nigeria. IOSR Journal of Business and Management, 19(9): 1-9. Retrieved from www.iosrjournals.org
[31] Elayan, F. A., Brown, K., Pacharn, P., Chen, Y., & Li, J. (2024). Auditee Merger, Audit Fees, and the Market Dominance of Big Four Accounting Firms. Audit Fees, and the Market Dominance of Big Four Accounting Firms. DOI: 10.2139/ssrn.4700711
[32] Elbardan, H., Kotb, A., & Ishaque, M. (2023). A Review of the Empirical Literature on Audit Market Concentration. The International Journal of Accounting, 2350006. DOI: 10.1142/S1094406023500063.
[33] Eshelman, J. D., and Lawson, B. P. (2017). Audit Market Structure and Audit Pricing. Account. Horizons, 31 (1): 57–81. DOI: 10.2308/acch-51603.
[34] Etro, F. (2014). The Theory of Endogenous Market Structures. Journal of Economic Surveys, 28: 804–830. DOI: 10.1111/joes.12020.
[35] Ettredge, M., & Greenberg, R. (1990). Determinants of fee-cutting on initial audit engagements. Journal of accounting research, 28(1): 198-210. DOI: 10.2307/2491224.
[36] Francis, J. R., Michas, P. N., & Seavey, S. E. (2013). Does Audit Market Concentration Harm the Quality of Audited Earnings? Evidence from Audit Markets in 42 Countries. Contemporary Accounting Research, 30(1): 325-355. DOI: 10.1111/j.1911-3846.2012.01156.x.
[37] Ghosh, A., & Pawlewicz, R. (2009). The impact of Regulation on Auditor Fees: Evidence from the Sarbanes-Oxley Act. Audit.: A J. Pract. Theory, 23 (2): 67–78. DOI: 10.2308/aud.2009.28.2.171
[38] Ghosh, A., and Lustgarten, S. (2006). Pricing of Initial Audit Engagements by Large and Small Audit Firms. Contemporary Accounting Research, 23(2): 333–368. DOI: 10.1506/927U-JGJY-35TA-7NT1
[39] Gunn, J. L., Kawada, B. S., & Michas, P. N. (2019). Audit Market Concentration, Audit Fees, and Audit Quality: A Cross-Country Analysis of Complex Audit Clients. Journal of Accounting and Public Policy, 38(6). DOI: 10.1016/j.jaccpubpol.2019.106693
[40] Guo, Q., Koch, C., & Zhu, A. (2017). Joint Audit, Audit Market Structure, and Consumer Surplus. Review of Accounting Studies, 22: 1595-1627. DOI: 10.1007/s11142-017-9429-8
[41] Hay, D. A., & Liu, G. S. (1997). The efficiency of firms: what difference does competition make? The Economic Journal, 107(442): 597-617. DOI: 10.1111/j.1468-0297.1997.tb00029.x
[42] Hay, D. C., Knechel, W. R., & Wong, N. (2006). Audit fees: A meta‐analysis of the effect of supply and demand attributes. Contemporary accounting research, 23(1). DOI: 10.1506/4XR4-KT5V-E8CN-91GX
[43] Huang, H. W., Raghunandan, K., Huang, T. C., & Chiou, J. R. (2015). Fee discounting and audit quality following audit firm and audit partner changes: Chinese evidence. The Accounting Review, 90(4): 1517-1546. DOI: 10.2308/accr-50958
[44] Huang, T. C., Chang, H., & Chiou, J. R. (2016). Audit Market Concentration, Audit Fees, and Audit Quality: Evidence from China. Auditing: J. Practice Theory, 35 (2): 121–145. DOI: 10.2308/ajpt-51299
[45] Jeter, D. C., & Shivakumar, L. (1999). Cross-sectional estimation of abnormal accruals using quarterly and annual data: Effectiveness in detecting event-specific earnings management. Accounting and Business Research, 29(4): 299-319. DOI: 10.1080/00014788.1999.9729590
[46] Kacer, M., Duboisée De Ricquebourg, A., Peel, M. J., & Wilson, N. (2023). Audit market measures in audit pricing studies: The issue of mechanical correlation. European Accounting Review, 1-33. DOI:10.1080/09638180.2023.2214169
[47] Kallapur, S., Greenberg, S., & Zang, Y. (2010). Audit Market Competition and Audit Quality. Indian School of Business Gachibowli, Hyderabad, 500032, 1-55. DOI: 10.2139/ssrn.1546356
[48] Kamolane, P., & Odendaal, E. (2021). Audit Market Concentration within the South African Listed Market: An Industry Perspective. Southern African Journal of Accountability and Auditing Research, 23(1): 77-96. DOI:10.54483/sajaar.2021.23.1.6.
[49] Kim, S., Cho, H., Cho, M., Lee, B. B. H., & Lee, W. J. (2024). Flexible CPA staffing in non‐Big 4 audit firms: Its determinants and implications for audit fees and audit quality. International Journal of Auditing, 28(2): 364-387. DOI: 10.1111/ijau.12335
[50] Kitto, A. R. (2024). The effects of non-Big 4 mergers on audit efficiency and audit market competition☆. Journal of Accounting and Economics, 77(1), 101618. DOI: 10.1016/j.jacceco.2023.101618
[51] Krishnan, G. V., and Tanyi, P. (2020). Does Regulating Audit Pricing Enhance Audit Quality and the Timeliness of Audit Reporting? The Texas Experience. Journal of Law, Finance, and Accounting, 5(1): 1-64. DOI: 10.1561/108.00000040
[52] Liu, W. P., & Huang, H. W. (2024). Internal control opinion shopping: Does initial audit fee discounting matter? Research in International Business and Finance, 69, 102248. DOI: 10.1016/j.ribaf.2024.102248
[53] López, D. M., & Peters, G. F. (2011). Auditor workload compression and busy season auditor switching. Accounting Horizons, 25(2): 357–380. DOI: 10.2308/acch-10026
[54] Marrian, I., & Pong, C. (2007). Competitiveness. of the Audit Services Market. Managerial Auditing Journal, 22(2). DOI: 10.1108/maj.2007.05122baa.001
[55] Ndubuisi, O., Henry, W. O., & Horsfall, F. V. F. (2025). Firm Attributes and Share Price of Quoted Firms in Nigeria: Analysis of Investors' Evaluations of Financial and Non-Financial Sectors. Research Journal of Management Practice| ISSN, 2782, 7674.
[56] Newton, N. J., Wang, D., & Wilkins, M. S. (2013). Does A Lack of Choice Lead to Lower Quality? Evidence from Auditor Competition and Client Restatements. Auditing: A Journal of Practice & Theory, 32(3): 31-67. DOI: 10.2308/ajpt-50461
[57] Ng, H. Y., Tronnes, P. C., & Wong, L. (2018). Audit Seasonality and Pricing of Audit Services: Theory and evidence from a meta-analysis. Journal of Accounting Literature, 40(1): 16-28. DOI:10.1016/j.acclit.2017.11.003
[58] Nicholson, W., & Snyder, C. (2008). Microeconomic Theory: Basic Principles and Extensions (Tenth). Thomson Higher Education, Mason, OH.
[59] Noll, R. G. (2004). Buyer power and economic policy. Antitrust LJ, 72, 589.
[60] Numan, W., & Willekens, M. (2012). An Empirical Test of Spatial Competition in the Audit Market. Journal of Accounting and Economics, 53(1): 450-465. DOI: 10.1016/j.jacceco.2011.10.002
[61] Nwosu, C. (2023). Exploring the effectiveness of anti-corruption laws in Nigeria: a comparative study of legal frameworks and practical outcomes. American Journal of Law and Political Science, 2(1): 67-75. DOI:10.58425/ajlps.v2i1.153
[62] Ogbe, H. E., & Oyibokure, G. I. (2023). Impact assessment of the COVID-19 pandemic and the Nigerian judicial system. Social Science Research, 9(1): 19-36. Available at: https://journals.aphriapub.com/index.php/SSR/article/view/2046/1898
[63] Okaro, S. C. & Okafor, G. O. (2013). Audit Market Concentration In Nigeria: An Empirical Study. Available at: https://www.researchgate.net/publication/277728546_Audit_Market_Concentration-_An_Empirical_Study
[64] Pearson, T., & Trompeter, G. (1994). Competition in the Market for Audit Services: The Effect of Supplier Concentration on Audit Fee. Contemporary Accounting Research, 11(1): 115-135. DOI: 10.1111/j.1911-3846.1994.tb00439.x.
[65] Peel, M. J. (2013). The pricing of initial audit engagements by big 4 and leading mid-tier auditors. Accounting and Business Research, 43(6): 636-659. DOI: 10.1080/00014788.2013.827106
[66] Pilat, D. (1996). Competition, productivity and efficiency. OECD Economic Studies, 27(2): 107-46.
[67] Pindyck, R.S. & Rubinfeld, D. L. (2018), Microeconomics, Ninth Edition, Global Edition, Pearson, Harlow, England.
[68] Salifu, M., Peprah, J. A., & Cantah, W. G. (2024). Legal Systems, Property Rights, and Financial Development in Sub-Saharan Africa. SAGE Open, 14(2). DOI: 10.1177/21582440241257932.
[69] Scheidt, I. (2020). The Audit Oligopoly in the European Union: Quantitative Analysis on the Client Industry Structure for the Big Four Audit Firms in the European Union. Available at: https://www.diva-portal.org/smash/get/diva2:1512896/FULLTEXT01.pdf
[70] Simac, I., & Willekens, M. (2024). Competitive Strategies for Small Audit Firms. The International Journal of Accounting, 2450012. DOI: 10.1142/S1094406024500124.
[71] Simon, D. T., & Francis, J. R. (1988). The effects of auditor change on audit fees: Tests of price cutting and price recovery. Accounting Review, 255-269. Available at: https://www.jstor.org/stable/248104
[72] Simons, D., & Zein, N. (2016). Audit market segmentation–The impact of mid-tier firms on competition. European accounting review, 25(1): 131-154. DOI: 080/09638180.2014.990476
[73] Sirois, L. P., & Simunic, D. A. (2011). Auditor size and audit quality revisited: The importance of audit technology. Available at SSRN 1694613. Available at: https://www.cairn-int.info/revue-accounting-auditing-control-2016-3-page-111.htm&wt.src=pdf
[74] Soyemi, K. A., Oluwatuyi, A. O., & Adeyemi, O. A. (2025). Key Audit Matters Disclosure (KAMD), Audit Quality and Financial Reporting Quality of Quoted Non-financial Firms in Nigeria. AKSU Journal of Administration and Corporate Governance (AKSUJACOG), 5(1): 118-132.
[75] Stiglitz, J. (1987). Competition and the Number of Firms in a Market: are Duopolies More Competitive than Atomistic Markets. Journal of Political Economics, 95(5): 1041–1061.
[76] Sutton, J. (1991). Sunk Costs and Market Structure: Price Competition, Advertising, and the Evolution of Concentration. Cambridge, MA: MIT Press.
[77] Urhoghide, R. O., & Izedonmi, F. O. I. (2015). An empirical investigation of audit fee determinants in Nigeria. International Journal of Business and Social Research, 5(8): 48-58. Available at: https://thejournalofbusiness.org/index.php/site/article/view/785/547.
[78] Van Raak, J., Peek, E., Meuwissen, R., & Schelleman, C. (2020). The Effect of Audit Market Structure on Audit Quality and Audit Pricing in The Private‐Client Market. Journal of Business Finance & Accounting, 47(3-4): 456-488. DOI: 10.1111/jbfa.12414
[79] Willekens, M., Dekeyser, S., Bruynseels, L., & Numan, W. (2023). Auditor Market Power and Audit Quality Revisited: Effects of Market Concentration, Market Share Distance, and Leadership. Journal of Accounting, Auditing & Finance, 38(1): 161-181. DOI: 10.1177/0148558X20966249
[80] Xin, Q., Liu, Y., & Tang, Y. (2023). China's audit market competition and the competitive strategies of the international Big 4 audit firms. China Journal of Accounting Studies, 11(3): 574-601. DOI:10.1080/21697213.2023.2239675
[81] Zerni, M. (2012). Audit Partner Specialisation and Audit Fees: Some Evidence from Sweden. Contemporary Accounting Research, 29(1): 312-340. DOI: 10.1111/j.1911-3846.2011.01098.x
[82] Zhang, S. (2012). Surge in Audit Fees Leads to Complaints from Business Firms (in Chinese). Southern Daily News. Retrieved from http://epaper.nfdaily.cn/html/2012-07/20/content_7106019.htm.
[83] Companies and Allied Matters Act (2020).
[84] Competition & Markets Authority () (2019). Statutory audit services market study. London: competition & markets authority.
[85] Financial Reporting Council (FRC) (2018). Developments in audit. London: Financial Reporting Council. https://eaa-online.org/app/uploads/sites/3/2019/12/https__www.frc_.org_.uk_getattachment_5d176788-3330-4b62-b18e-276c678d3d2c_Developments-in-Audit-FINAL-05-Nov-2019.pdf.
[86] Financial Reporting Council of Nigeria (2011).
[87] GAO - General Accounting Office. (2008). Auditors of public companies. Continued concentration in audit market for large public companies does not call for immediate action.
[88] General Accounting Office. (2003). Public Accounting Firms: Mandated Study on Consolidation and Competition. Washington DC: GAO.
[89] IAB. (2013). A profession adapting to a changing world. International Accounting Bulletin, 521: 7–13.
[90] National Code of Corporate Governance (2016)
[91] National Code of Corporate Governance (2018)
[92] Oxera. (2006). Competition and Choice in the UK Audit Market: Prepared for the Department of Trade and Industry and Financial Reporting Council. Oxera Consulting (Oxford. UK).
[93] Oxera. (2007). Ownership Rules of Audit Firms and their Consequences for Audit Market Concentration. England.
[94] Pwc, (2012). Submission and Response to Issues Statement: Pricewaterhouse Coopers LLP. London: Competition Commission. Available at: http://www.competition-commission.org.uk/assets/competitioncommission/docs/2011/statutory-auditservices/pwc_response_to_is_non_confidentialversion.pdf
[95] United States Treasury. (2008). Advisory committee on the auditing profession: Final report, October 6, 2008. Available at: http://www.treas.gov/offices/domestic-finance/acap/docs/final-report.pdf
Published
2025-09-30
How to Cite
INNEH, Eghosa Godwin; AYOOLA, Tajudeen John; OBOKOH, Lawrence Ogechukwu.
Competition in an Audit Segmented Market: Evidence from the Nigerian Listed Non-Financial Firms.
Theoretical and Practical Research in Economic Fields, [S.l.], v. 16, n. 3, p. 723 - 741, sep. 2025.
ISSN 2068-7710.
Available at: <https://journals.aserspublishing.eu/tpref/article/view/9113>. Date accessed: 08 oct. 2025.
doi: https://doi.org/10.14505/tpref.v16.3(35).14.
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