Auditor Independence and Earnings Quality: Evidence for Market Discipline vs. Sarbanes-Oxley Proscriptions∗

Does auditor independence improve earnings quality and, if so, is regulation necessary to realize such improvements? Popular characterizations of recent governance scandals answer “yes! ” but lack support from scholarly investigations. This disagreement motivates our investigation of whether auditor independence affects earnings quality in ways that prior research would have missed, and what any such effect means for the efficiency-consequences of related governance regulations. 1. We relax a priori data-restrictions that ignore the potential for auditors ’ dependence on consulting fees to enhance earnings quality. 2. We measure unexpected accounting fees in a more defensible manner, and develop a matching estimator to examine whether fee disclosures improve asset-pricing efficiency; and 3. We empirically evaluate the potential for governance externalities to rationalize proscriptive regulations. Our results offer some support for auditor independence improving earnings quality