The Impact of Illegal Business Practice on Shareholder Returns.

Data regarding illegal firm behavior were obtained for the period 1980-1990. Using the single index market model, the study finds that public announcements of indictments for major corporate crimes have a significant and long-term negative impact upon shareholder wealth, particularly for firms found guilty of the indictment. The results indicate that indictments of larger firms have a proportionally smaller impact on excess returns. Furthermore, indictments handed down since the Levine/Boesky scandal appear to have had a more adverse impact. Copyright 1996 by MIT Press.