Our analyses, from a sample of 181 SEC registrants, suggest that the
investment in internal auditing (internal audit budget) is negatively
related to the presence of auditing experts on the committee
and the average tenure of audit committee members, but positively
related to the number of audit committee meetings (a proxy
for audit committee diligence). These observations suggest potential
complementary and substitution effects between the audit
committee and internal auditing, and thus raise important implications
for future research.