Deep Dive: Competition probe launched into 65 audit institutions including Big Four

From the Chief Economist's lens, this competition probe into 65 audit institutions, including the Big Four (the four largest global accounting firms: Deloitte, PwC, EY, and KPMG), addresses longstanding concerns over market concentration in auditing services. Audit markets exhibit high barriers to entry due to regulatory requirements and reputation effects, with the Big Four controlling over 90% of FTSE 350 audits in the UK per Financial Reporting Council data, leading to reduced price competition and innovation stagnation. The Turkish Competition Authority (TCA, Turkey's antitrust regulator) initiating this probe signals a policy response to oligopolistic structures, potentially mirroring EU efforts like the 2023 consultation on audit market reforms. The Chief Financial Analyst views this as a pivotal event for capital markets, where audit quality underpins investor confidence. Dominance by the Big Four has been linked to higher audit fees—averaging 20-30% premiums per Oxera studies—and reduced choice for listed companies, impacting equity valuations. If the probe uncovers cartels or abuse of dominance, fines could reach 10% of global turnover under Turkish law (Law No. 4054), pressuring stock prices; Big Four firms traded at 20-25x earnings multiples in 2023, vulnerable to regulatory risk discounts. Stakeholders include public companies facing audit tendering mandates and investors in audit firm equities. For the Senior Consumer Finance Advisor, indirect effects ripple to households via corporate governance. Weak competition inflates audit costs passed onto consumers through higher product prices—estimated at 0.5-1% of GDP in concentrated sectors per OECD reports—and erodes pension fund returns, as audits validate 401(k)-style investments. Ordinary savers in Turkey, with household savings rates at 18% of disposable income (TurkStat 2023), bear costs from inefficient capital allocation. Probe outcomes could lower fees by 10-15%, marginally easing cost of living pressures on retail banking clients. Outlook: Expect prolonged scrutiny, with remedies like fee caps or market sharing akin to Australia's 2018 reforms, fostering contestability. This aligns with global antitrust trends post-2008, where central banks like the ECB noted audit concentration risks to financial stability. Impacts hinge on findings, but precedent suggests modest fee reductions benefiting downstream economic actors.