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Why did the Big Four get so large? Evidence from Australia

Author

Listed:
  • Colin Ferguson

    (University of Melbourne)

  • Matthew Pinnuck

    (University of Melbourne)

  • Douglas J. Skinner

    (University of Chicago)

Abstract

We use a long time-series from Australia to shed light on economic factors that led to audit market concentration and the Big N. We show that increases in the size of a small number of public companies was an important factor that led to large audit firms and market concentration. We also show that emerging Big N firms made sunk cost investments, including in the ability to provide industry expertise and non-audit services, which allowed them to retain clients, differentiate, and grow. These changes occurred around the time the profession lifted restrictions on advertising, which helped facilitate differentiation, and that larger, more complex clients switched to emerging Big N firms while smaller clients switched to non-Big N firms. We do not find that increases in audit market concentration reduced competition; our results instead suggest the audit market became more competitive over time.

Suggested Citation

  • Colin Ferguson & Matthew Pinnuck & Douglas J. Skinner, 2025. "Why did the Big Four get so large? Evidence from Australia," Review of Accounting Studies, Springer, vol. 30(3), pages 2508-2554, September.
    • Handle: RePEc:spr:reaccs:v:30:y:2025:i:3:d:10.1007_s11142-025-09871-x
    DOI: 10.1007/s11142-025-09871-x
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    as
    1. Steven Berry & Martin Gaynor & Fiona Scott Morton, 2019. "Do Increasing Markups Matter? Lessons from Empirical Industrial Organization," Journal of Economic Perspectives, American Economic Association, vol. 33(3), pages 44-68, Summer.
    2. Stephen V. Brown & W. Robert Knechel, 2016. "Auditor–Client Compatibility and Audit Firm Selection," Journal of Accounting Research, John Wiley & Sons, Ltd., vol. 54(3), pages 725-775, June.
    3. Doogar, Rajib & Easley, Robert F., 1998. "Concentration without differentiation: A new look at the determinants of audit market concentration," Journal of Accounting and Economics, Elsevier, vol. 25(3), pages 235-253, June.
    4. Ian D. Gow & David F. Larcker & Peter C. Reiss, 2016. "Causal Inference in Accounting Research," Journal of Accounting Research, John Wiley & Sons, Ltd., vol. 54(2), pages 477-523, May.
    5. Zhan Shu, Susan, 2000. "Auditor resignations: clientele effects and legal liability," Journal of Accounting and Economics, Elsevier, vol. 29(2), pages 173-205, April.
    6. Raphael Duguay & Michael Minnis & Andrew Sutherland, 2020. "Regulatory Spillovers in Common Audit Markets," Management Science, INFORMS, vol. 66(8), pages 3389-3411, August.
    7. Daniel Aobdia & Luminita Enache & Anup Srivastava, 2021. "Changes in Big N auditors’ client selection and retention strategies over time," Review of Quantitative Finance and Accounting, Springer, vol. 56(2), pages 715-754, February.
    8. David Autor & David Dorn & Lawrence F Katz & Christina Patterson & John Van Reenen, 2020. "The Fall of the Labor Share and the Rise of Superstar Firms [“Automation and New Tasks: How Technology Displaces and Reinstates Labor”]," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 135(2), pages 645-709.
    9. Xavier Gabaix, 2009. "Power Laws in Economics and Finance," Annual Review of Economics, Annual Reviews, vol. 1(1), pages 255-294, May.
    10. Okeefe, Tb & Simunic, Da & Stein, Mt, 1994. "The Production Of Audit Services - Evidence From A Major Public Accounting Firm," Journal of Accounting Research, John Wiley & Sons, Ltd., vol. 32(2), pages 241-261.
    11. Johnson, W. Bruce & Lys, Thomas, 1990. "The market for audit services : Evidence from voluntary auditor changes," Journal of Accounting and Economics, Elsevier, vol. 12(1-3), pages 281-308, January.
    12. Gow, Ian D. & Larcker, David F. & Reiss, Peter C., 2016. "Causal Inference in Accounting Research," Research Papers 3393, Stanford University, Graduate School of Business.
    13. Watts, Ross L & Zimmerman, Jerold L, 1983. "Agency Problems, Auditing, and the Theory of the Firm: Some Evidence," Journal of Law and Economics, University of Chicago Press, vol. 26(3), pages 613-633, October.
    14. Joseph Gerakos & Chad Syverson, 2015. "Competition in the Audit Market: Policy Implications," Journal of Accounting Research, John Wiley & Sons, Ltd., vol. 53(4), pages 725-775, September.
    15. Astrid A. Dick, 2007. "Market Size, Service Quality, and Competition in Banking," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 39(1), pages 49-81, February.
    16. David C. Hay & W. Robert Knechel & Norman Wong, 2006. "Audit Fees: A Meta†analysis of the Effect of Supply and Demand Attributes," Contemporary Accounting Research, John Wiley & Sons, vol. 23(1), pages 141-191, March.
    17. Sutton, John, 2007. "Market Structure: Theory and Evidence," Handbook of Industrial Organization, in: Mark Armstrong & Robert Porter (ed.), Handbook of Industrial Organization, edition 1, volume 3, chapter 35, pages 2301-2368, Elsevier.
    18. Paul B. Ellickson, 2007. "Does Sutton apply to supermarkets?," RAND Journal of Economics, RAND Corporation, vol. 38(1), pages 43-59, March.
    19. Tim Pearson & Greg Trompeter, 1994. "Competition in the Market for Audit Services: The Effect of Supplier Concentration on Audit Fees," Contemporary Accounting Research, John Wiley & Sons, vol. 11(1), pages 115-135, June.
    20. Simunic, Da, 1980. "The Pricing Of Audit Services - Theory And Evidence," Journal of Accounting Research, John Wiley & Sons, Ltd., vol. 18(1), pages 161-190.
    21. Joseph Gerakos & Chad Syverson, 2017. "Audit firms face downward-sloping demand curves and the audit market is far from perfectly competitive," Review of Accounting Studies, Springer, vol. 22(4), pages 1582-1594, December.
    22. Davies, Stephen, 1980. "Minimum Efficient Size and Seller Concentration: An Empirical Problem," Journal of Industrial Economics, Wiley Blackwell, vol. 28(3), pages 287-301, March.
    23. Willekens, Marleen & Achmadi, Christina, 2003. "Pricing and supplier concentration in the private client segment of the audit market: Market power or competition?," The International Journal of Accounting, Elsevier, vol. 38(4), pages 431-455.
    24. DeFond, Mark L. & Subramanyam, K. R., 1998. "Auditor changes and discretionary accruals," Journal of Accounting and Economics, Elsevier, vol. 25(1), pages 35-67, February.
    25. Kim, Tae-Hwan & White, Halbert, 2004. "On more robust estimation of skewness and kurtosis," Finance Research Letters, Elsevier, vol. 1(1), pages 56-73, March.
    26. Sati P. Bandyopadhyay & Jennifer L. Kao, 2004. "Market Structure and Audit Fees: A Local Analysis," Contemporary Accounting Research, John Wiley & Sons, vol. 21(3), pages 529-562, September.
    27. Mark A. Satterthwaite, 1979. "Consumer Information, Equilibrium Industry Price, and the Number of Sellers," Bell Journal of Economics, The RAND Corporation, vol. 10(2), pages 483-502, Autumn.
    28. Willekens, Marleen, 2003. "Reply to discussion of "Pricing and supplier concentration in the private client segment of the audit market: Market power or competition?"," The International Journal of Accounting, Elsevier, vol. 38(4), pages 461-464.
    29. Kitto, Andrew R., 2024. "The effects of non-Big 4 mergers on audit efficiency and audit market competition☆," Journal of Accounting and Economics, Elsevier, vol. 77(1).
    30. Francis, Jr & Stokes, Dj, 1986. "Audit Prices, Product Differentiation, And Scale Economies - Further Evidence From The Australian Market," Journal of Accounting Research, John Wiley & Sons, Ltd., vol. 24(2), pages 383-393.
    31. DeAngelo, Linda Elizabeth, 1981. "Auditor size and audit quality," Journal of Accounting and Economics, Elsevier, vol. 3(3), pages 183-199, December.
    32. Numan, Wieteke & Willekens, Marleen, 2012. "An empirical test of spatial competition in the audit market," Journal of Accounting and Economics, Elsevier, vol. 53(1), pages 450-465.
    33. Armstrong, Christopher & Kepler, John D. & Samuels, Delphine & Taylor, Daniel, 2022. "Causality redux: The evolution of empirical methods in accounting research and the growth of quasi-experiments," Journal of Accounting and Economics, Elsevier, vol. 74(2).
    34. Theodosia Konstantinidi & Peter F. Pope, 2016. "Forecasting Risk in Earnings," Contemporary Accounting Research, John Wiley & Sons, vol. 33(2), pages 487-525, June.
    35. Astrid A. Dick, 2007. "Market Size, Service Quality, and Competition in Banking," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 39(1), pages 49-81, February.
    36. Ettredge, Michael & Fuerherm, Elizabeth Emeigh & Li, Chan, 2014. "Fee pressure and audit quality," Accounting, Organizations and Society, Elsevier, vol. 39(4), pages 247-263.
    37. DeFond, Mark & Zhang, Jieying, 2014. "A review of archival auditing research," Journal of Accounting and Economics, Elsevier, vol. 58(2), pages 275-326.
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    Keywords

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    JEL classification:

    • L11 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Production, Pricing, and Market Structure; Size Distribution of Firms
    • L51 - Industrial Organization - - Regulation and Industrial Policy - - - Economics of Regulation
    • M21 - Business Administration and Business Economics; Marketing; Accounting; Personnel Economics - - Business Economics - - - Business Economics
    • M42 - Business Administration and Business Economics; Marketing; Accounting; Personnel Economics - - Accounting - - - Auditing

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