The Role of Big 4 Auditors in Mitigating Information Asymmetry
Examining how Big 4 firms utilize audit quality as a signal to mitigate information asymmetry and agency costs between management and investors.
In the capital market, management always possesses more comprehensive information than external shareholders (information asymmetry). To bridge this gap, companies hire independent auditors. In literature, the size of the Public Accounting Firm—especially affiliations with the Big 4 (PwC, EY, Deloitte, KPMG)—is often used as the primary proxy for audit quality.
Reputation and Deep Pockets Theory
Why are the Big 4 considered higher quality? Reputation Capital and Deep Pockets theories explain that large firms have global reputations to protect. If they fail to detect material fraud (audit failure), the reputational damage and legal litigation risks they bear are massive. Therefore, Big 4 auditors tend to be much more conservative, independent, and resistant to client pressure.
Impact on Information Asymmetry
This superior audit quality functions as a credible signal to the market (Signaling Theory). Empirically, companies audited by the Big 4 have narrower bid-ask spreads, lower stock volatility, and more controlled levels of earnings management (discretionary accruals). Audit reports from the Big 4 dampen investor skepticism towards financial statement figures.
Research Proxies
In a thesis, aside from the Big 4 vs Non-Big 4 dummy variable, modern researchers also begin using proxies like Audit Fee, Audit Tenure, and Auditor Industry Specialization to capture more precise dimensions of audit quality.