V. Conclusion
This article investigates the association between unions and external audits, particularly the choice of Big 4 or industry specialist auditors. We also test the association between unions and abnormal audit fees and audit hours. To gain ascendancy in wage negotiations with management, unions try to obtain quality information, while management is reluctant to share inside information. We posit that strong unions will more successfully push management to select high-quality auditors and to demand highquality audit services.
Using Korean unique data, we find that unions affiliated with Minju (the strongest unions) positively affect the choice of Big 4/industry specialist auditor, while unions without any affiliation (the weakest) negatively affect this choice. Unions associated with Hanguk (modest unions) have no impact on the choice of Big 4 auditor/industry specialist.
Moreover, Minju reduces (increases) positive (negative) abnormal audit fees and hours. These results hold even after we control for firm characteristics using a PSM. Hanguk also generally reduces abnormal audit fees and hours, although the influence is not as strong as Minju. The overall results suggest that the strongest unions increase audit quality, while the most management-friendly unions, the nonaffiliated ones, do not. Hanguk in some sense increases audit quality, but less than Minju.