We analyze the role of discretionary joint fixed costs in audit production. Given such costs, the investment decision and production of audit services must be analyzed over a client portfolio. We model this problem, and use monotone comparative statics (Milgrom and Shannon [1994]) to show the implications of variations in client-specific losses and the number of clients for the optimum level of fixed investment and audit assurance. We develop four hypotheses concerning the relations between audit quality and (1) the magnitude of potential client-specific losses; (2) average client losses in a portfolio; (3) the number of clients in a portfolio; and (4) the variability of losses in a portfolio. Using discretionary accruals as the audit quality proxy, we find evidence consistent with these hypotheses. Using PCAOB inspection results, and financial statement restatements as proxies for audit quality, we find weaker evidence consistent with hypotheses 2, 3 and 4.
The market for audit services has been the subject of extensive academic research since the 1970s. The prevailing view is that audit markets are characterized by tiers of suppliers (Big 4 versus non-Big 4, and industry specialists versus non-specialists) where the upper tier suppliers produce and sell a systematically higher level of assurance, while competition among suppliers within tiers is essentially perfect and a uniform price prevails within the submarkets. We discuss three papers that challenge this orthodoxy. These papers argue and find that the price of an audit is essentially unique to each (auditor, client) pair and that this price depends on both audit firm size and client size. Furthermore, audit firm size is linked with the firm's capital investments, which enhance auditor efficiency and market power. We conclude that audit markets are atomistic and that local market power is an important determinant of audit prices and audit fees.
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