The total absence of mid-tier firms from the Straits Times Index audit market raises significant concerns about the lack of competition and the potential for systemic fragility. When the audit market is restricted to only four players, the entire financial system becomes overly dependent on a small group of institutions. Critics argue that this concentration limits innovation, keeps the audit market stagnant, and creates a 'too-big-to-fail' dynamic that could have severe consequences if one of the Big Four were to face a major regulatory or operational crisis.
Beyond the competitive aspect, there are concerns about the 'groupthink' that can emerge when a small number of firms dominate the landscape. A more diverse audit market, which includes mid-sized players, could potentially offer fresh perspectives and more robust challenges to corporate management. By excluding firms like Baker Tilly, BDO, or RSM from the top tier, the market misses out on the agility and specialized focus that these firms often bring to their clients. This exclusion is not necessarily based on a lack of capability, but rather on an entrenched preference for the 'Big Four' brand, which acts as a barrier to entry for otherwise qualified competitors.
Ultimately, the lack of a fifth player or a more competitive landscape may not be in the best interest of the long-term health of the Singapore market. If the audit sector remains a closed shop, it may become increasingly difficult to drive improvements in audit quality or to adapt to new challenges in corporate governance. For investors, the reliance on a narrow set of auditors means that the 'check and balance' function of an audit is effectively performed by a very small, homogeneous group, which may not always be the most effective way to ensure true transparency and accountability.