We examine a sample of 8,313 cases, between 1951 and 2001, where firms unexpectedly increase their research and development (R&D) expenditures by a significant amount. We find consistent evidence of a misreaction, as manifested in the significantly positive abnormal stock returns that our sample firms' shareholders experience following these increases. We also find consistent evidence that our sample firms experience significantly positive long‐term abnormal operating performance following their R&D increases. Our findings suggest that R&D increases are beneficial investments, and that the market is slow to recognize the extent of this benefit (consistent with investor underreaction).

We examine the relation between auditor characteristics (quality and tenure) and the cost of debt financing. Consistent with the hypothesis that audit characteristics are important to the capital markets, we find that (1) auditor quality and tenure are negatively and significantly related to the cost of debt financing, (2) the relation between auditor characteristics and the cost of debt is most pronounced in firms with debt that is noninvestment grade, and (3) both the insurance and information role of audits are economically significant to the cost of debt. Overall, our results suggest that, through their dual roles of providing information and insurance, auditor quality and tenure matter to capital market participants.