6. Conclusions
This study investigates how accounting comparability affects the overall quality and perceived risk of an external audit. Comparability enables auditors to identify similarities and differences in how client firms’ economic events are translated into accounting results over time and across clients. I argue that comparability reflects low audit risk from inherent client business risk per se, and provides a positive externality gain from and for multiple audit engagements. I predict that accounting comparability is negatively associated with audit risk and audit delay, and positively associated with audit quality and opinion accuracy. Empirical tests indicate that comparability is systemically associated with audit efficiency and accuracy. Specifically, it shows that comparability is negatively related to audit service fees and audit delay, and positively related to audit opinion accuracy (both Type I and Type II errors).
This study is important in expanding our understanding of the accounting quality of comparability. An audit client with a higher degree of information comparability is associated with a lower level of information risk and audit risk. At the same time, comparability contributes to externality gains that result in audit efficiency. Comparability has a dual effect: (i) lower audit fees, which benefit auditees, and (ii) more timely and accurate audit reporting, which benefits auditors. Given the role of externalities in expanding auditors’ available information set, the study of intraindustry information transfers in audit engagements provides additional insights into the economic benefits of audit accuracy and audit efficiency.