The impact of diversity on audit efficiency

Dr. Minlei Ye, an associate professor of accounting at the University of Toronto Mississauga, along with her coauthors (Mingcherng Deng, Eunhee Kim, and Tong Lu), developed a theoretical economic model aimed at examining the behaviours within diverse versus  homogenous audit teams.

In this context, diversity encompasses various aspects, including professional experience, cultural background, educational qualifications, age, race, gender, religion, and other characteristics that distinguish the team members. These audit teams consist of two staff members and an overseeing audit partner who leads the group.

Dr. Ye notes, "Auditing is very important because we need the independent third-party auditors to verify financial statements and help increase their credibility in the capital markets. Without auditors, it would be much harder for investors to trust companies and feel confident investing their money in them."

Her pioneering research marks the first instance of applying a theoretical framework to determine the optimal compositions for audit teams, moving beyond the traditional reliance on empirical studies. 

"Empirical evidence doesn't really tell us when diverse teams can be better than homogenous teams, so theoretical analysis can help us think through the economic tradeoffs and identify the conditions under which one type of team may perform better than the others," Dr. Ye explains.

She elaborates, "The paper provides a framework analyzing the tradeoff between diversity versus homogeneity, so it does not argue that one is always better or worse than the other. 

In Dr. Ye's working paper, the "audit team production model" explores how staff myopia and partner conservatism shape implicit team incentives for cooperation and collusion of staff members in both diverse and homogenous teams.

Staff myopia refers to "whether the staff has a long career horizon at the audit firm." 

Some employees stay at an audit firm briefly while they earn their Chartered Professional Accountant (CPA) designation before pursuing other job opportunities. Conversely, other employees might remain with the same audit firm for a much longer period.

Dr. Ye states, "If staff members are more long-term oriented and do not expect to change jobs quickly, they are considered less myopic. In contrast, if they are mainly focused on getting their CPA designation and then leaving for another job, they are considered more myopic."

Partner conservatism refers to the personal traits of the audit partner. The audit partner reviews the organization's financial statement and ultimately determines whether the reported financial information is presented fairly and whether any material misstatements may exist.

"Audit partners are essentially the key decision makers in determining what’s material and how issues should be addressed.” 

For example, if things are not quite certain, a more conservative partner may be less willing to simply issue a clean opinion and may instead choose to issue a modified opinion if they believe there are potential concerns.

A clean opinion, the most favorable assessment an audit partner can issue, affirms a company's financial statements are fairly presented, while a modified opinion indicates material issues or limitations identified during the audit.

Cooperation and collusion refer to the culture within a team and how two staff members work together. For instance, if they were to collude over two years, one might work in the first year while the other covers the subsequent year. Conversely, if the members cooperate, they both contribute in each year of the two-year period. This is the preferred outcome because "the likelihood of detecting material misstatements will increase."

Dr. Ye explains, "Theoretically we model like this to sharpen the underlying intuition and identify the key economic forces." 

Intuitively, homogeneous teams can be more efficient than diverse teams due to productive synergy among similar members. In contrast, diverse teams can combine non-overlapping perspectives or expertise so that one member’s effort increases the productivity of the other member’s effort. 

Their analysis shows that when staff members collude in a homogenous team, it is not as effective as when staff members cooperate in a diverse team, since both members working are better than only one member working.

Dr. Ye's findings indicate that diversified audit teams outperform homogenous ones when partner conservatism is high and staff myopia is low, since the diverse staff members will cooperate while the homogenous members will collude. 

For homogeneous teams, greater partner conservatism can actually encourage collusion among team members. As a result, when partner conservatism becomes sufficiently high, the audit quality produced by homogeneous teams can decline significantly if team members choose to collude. In contrast, diverse teams are less vulnerable to collusion regardless of the level of partner conservatism. 

Diverse audit teams also show better performance over homogenous ones when partner conservatism is low and staff myopia is moderate, because the diverse staff members will cooperate while the homogenous members will not. 

When audit partners are relatively aggressive, audit failure becomes more likely and the consequences of poor performance become more severe. This creates stronger incentives for team members to cooperate. However, this effect is stronger in diverse teams because team members bring different perspectives and skills that complement each other, making their joint effort more productive. 

As a result, under low partner conservatism, diverse teams are better able to encourage cooperation among staff members than homogeneous teams. This leads diverse teams to exert greater audit effort and increases the likelihood that they will obtain conclusive audit evidence and detect material misstatements. 

The research conducted by Dr. Ye and her coauthors provides important insights for regulatory policymakers as well as audit firms. The study outlines the circumstances under which regulatory policies and audit firms ought to encourage diversity and highlights the importance of considering how audit teams are structured in practice.

Dr. Ye clarifies, "We're not proposing that regulators to impose a blanket requirement in every situation. Instead, what we are saying is that specific circumstances matter, and audit firms also need to consider their own particular scenarios when designing teams."