Securities 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 …

The Logic And Limits Of Event Studies In Securities Fraud Litigation, Jill E. Fisch, Jonah B. Gelbach, Jonathan Klick

All Faculty Scholarship

Event studies have become increasingly important in securities fraud litigation after the Supreme Court’s decision in Halliburton II. Litigants have used event study methodology, which empirically analyzes the relationship between the disclosure of corporate information and the issuer’s stock price, to provide evidence in the evaluation of key elements of federal securities fraud, including materiality, reliance, causation, and damages. As the use of event studies grows and they increasingly serve a gatekeeping function in determining whether litigation will proceed beyond a preliminary stage, it will be critical for courts to use them correctly.

This Article explores an array of …

• The Credit Crisis And Subprime Litigation: How Fraud Without Motive ‘Makes Little Economic Sense’, Peter Hamner

Peter Hamner

The recent collapse of the financial markets spurred numerous lawsuits seeking a faulty party. Many plaintiffs argue that market participants committed securities fraud. They claim that deficient subprime loans caused the financial crisis. These risky loans were allegedly originated by banks to be sold off to third parties. The subprime loans were securitized and spread throughout the financial markets. The risk these loans presented was allegedly not disclosed to the buyers of the loans and securities on the loans. As these deficient loans and securities began to default the financial markets came to a halt. This article argues that securities …

The Sec And The Madoff Scandal: Three Narratives In Search Of A Story, Donald C. Langevoort

Georgetown Law Faculty Publications and Other Works

This essay, part of a symposium on narrative in corporate law, considers various portrayals of the complicity of the SEC in the Bernard Madoff scandal--including the Commission's own Inspector General's report issued in September 2009. It considers possible explanations (revolving door problems, incompetence and sloth, etc.) but suggests that the story is deeper and more frustrating, arising out of the relative poverty in which the SEC operates, which in turn leads to habits of thought and action that leave too much unnoticed and undone. The interesting question, then: why the poverty? The essay concludes with a political explanation. While by …

Rediscovering The Economics Of Loss Causation , Richard Kaplan, Madge Thorsen, Scott Hakala

ExpressO

Abstract This article explores the economic principles and theories underlying loss causation in the context of securities fraud litigation. It explains the difference between “investment loss” and recoverable “inflationary loss” and posits that the latter consists of the difference between inflation in stock prices caused by the fraud at the time of purchase and inflation in the price at the time of sale. It reviews scenarios in which inflationary loss due to fraud may occur and would be recognized as a matter of economic theory as well as a matter of law. It urges that Dura v. Broudo Pharmaceuticals, 125 …