Law Commons^™

Power And Statistical Significance In Securities Fraud Litigation, Jill E. Fisch, Jonah B. Gelbach

All Faculty Scholarship

Event studies, a half-century-old approach to measuring the effect of events on stock prices, are now ubiquitous in securities fraud litigation. In determining whether the event study demonstrates a price effect, expert witnesses typically base their conclusion on whether the results are statistically significant at the 95% confidence level, a threshold that is drawn from the academic literature. As a positive matter, this represents a disconnect with legal standards of proof. As a normative matter, it may reduce enforcement of fraud claims because litigation event studies typically involve quite low statistical power even for large-scale frauds.

This paper, written for …

Putting The Trial Penalty On Trial, David S. Abrams

All Faculty Scholarship

The "trial penalty" is a concept widely accepted by all the major actors in the criminal justice system: defendants, prosecutors, defense attorneys, court employees, and judges. The notion is that defendants receive longer sentences at trial than they would have through plea bargain, often substantially longer. The concept is intuitive: longer sentences are necessary in order to induce settlements and without a high settlement rate it would be impossible for courts as currently structured to sustain their immense caseload. While intuitively appealing, this view of the trial penalty is completely at odds with economic prediction. Since both prosecutors and defendants …