Instrumental variable (IV) methods are commonly used in accounting research (e.g., earnings management, corporate governance, executive compensation, and disclosure research) when the regressor variables are endogenous. While IV estimation is the standard textbook solution to mitigating endogeneity problems, the appropriateness of IV methods in typical accounting research settings is not obvious. Drawing on recent advances in statistics and econometrics, we identify conditions under which IV methods are preferred to OLS estimates and propose a series of tests for research studies employing IV methods. We illustrate these ideas by examining the relation between corporate disclosure and the cost of capital.

ABSTRACT We investigate Gompers, Ishii, and Metrick's (2003) finding that firms with weak shareholder rights exhibit significant stock market underperformance. If the relation between poor governance and poor returns is causal, we expect that the market is negatively surprised by the poor operating performance of weak governance firms. We find that firms with weak shareholder rights exhibit significant operating underperformance. However, analysts' forecast errors and earnings announcement returns show no evidence that this underperformance surprises the market. Our results are robust to controls for takeover activity. Overall, our results do not support the hypothesis that weak governance causes poor stock returns.

ABSTRACT We examine the causal effect of expected private litigation costs on voluntary disclosure using a natural experiment, the Supreme Court ruling in Morrison v. National Australia Bank. Even though this ruling had no effect on what constituted fraudulent conduct for the purpose of securities litigation, it significantly reduced the expected private litigation costs for foreign cross-listed firms by reducing the pool of potential claimants. It did so by eliminating the right of shareholders who purchased shares on non-U.S. exchanges from seeking compensation in U.S. courts. In the post-Morrison period, we find consistent evidence showing a decrease in voluntary disclosure using analyses that exploit the varying impact of the ruling based on both firm- and country-level attributes. Unlike a number of prior studies, we find that the positive relation between litigation and disclosure does not depend on the direction of the news. JEL Classifications: G15; G18; M41. Data Availability: Data are available from the public sources cited in the text.