Auditing for Performance Evaluation
[Williamson (1975) argues that firm organization is superior to open-market contracting due to the presence of an internal audit function that considers less formal evidence and explores byways not usually open to participants in open-market exchanges. This paper models the internal audit function as a scarce economic resource and the use of that resource for the provision of incentives. Information useful for incentives is assumed to be limited to verifiable information. The quantity of verifiable information produced by the internal audit function is constrained by either the time an internal auditor can spend verifying evidence or the time that employees have available to make such evidence verifiable (e.g., time spent with paperwork). The internal audit function is shown to produce near first-best solutions in a principal-agent model with simple and realistic policies that use only a small fraction of all available information. The attainment of such efficiency, however, depends on the level of management to which the internal auditors report. If independence is impaired, the firm may have to resort to other sources of contracting information, such as its financial reports. Because the information contained in financial reports is more limited than that provided by the internal audit function, first-best solutions may no longer be possible. Certain inadequacies of using financial reports as incentive devices may be mitigated by allowing the employee discretion over accounting alternatives. Such acts, however, may appear to outsiders to be income manipulations aimed solely at maximizing compensation.]