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SUMMARY: This paper examines IPO audit fees to assess the use of industry special- ization as a differentiation strategy by audit firms. We extend existing theory on the impact of industry specialization on audit fees by incorporating Porter's (1985) theory of competition and differentiation. We suggest that market share enables audit firms to gain competitive advantages in terms of cost and service. However, the impact of such advantages on fees depends on whether the audit firm has successfully differentiated itself from competitors within client industries. Our results indicate that as audit firm industry market share increases without a differentiation in market share, the audit fee charged for a given IPO decreases. In the context of Porter (1985), this result suggests that the client is able to bargain for a portion of the auditor's cost savings because the audit firm has not successfully differentiated itself from competitors. In contrast, we show that audit firms that possess significantly higher market shares than their industry competitors earn fee premiums, suggesting that audit firms that have successfully differ- entiated themselves retain a stronger bargaining position with their clients.

Audit Firm Industry Specialization as a Differentiation Strategy: Evidence from Fees Charged to Firms Going Public