The US auditing industry has been characterized as an oligopoly, which has successively tightened from eight key players to four over the last 25 years. This tightening is likely to change the incentives of the surviving big auditors, with implications for their role in our market economy. Motivated by the economic and public policy implications of the tightening audit oligopoly, the authors of this paper investigate the changing relation between the big firms and accounting standards. Accounting standards are a key input in the audit process and, through their effects on financial reporting, can impact capital allocation decisions in the economy.

Results show that the big auditors are more likely to identify decreased reliability in proposed standards as the auditing oligopoly has tightened: This suggests that big auditors perceive higher litigation and political costs from the increased visibility that accompanies tighter oligopoly. The findings are also consistent with tighter oligopoly decreasing competition among the surviving firms to satisfy client preferences in accounting standards. The findings do not support the concern that tightening oligopoly has rendered the surviving big firms "too big to fail."

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