Econometrics Commons^™

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

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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 …

Apple V. Pepper: Rationalizing Antitrust’S Indirect Purchaser Rule, Herbert J. Hovenkamp

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In Apple v. Pepper the Supreme Court held that consumers who allegedly paid too much for apps sold on Apple’s iStore could sue Apple for antitrust damages because they were “direct purchasers.” The decision reflects some bizarre complexities that have resulted from the Supreme Court’s 1977 decision in Illinois Brick, which held that only direct purchasers could sue for overcharge injuries under the federal antitrust laws. The indirect purchaser rule was problematic from the beginning. First, it was plainly inconsistent with the antitrust damages statute, which gives an action to “any person who shall be injured in his business …

Intermediated Securities Holding Systems Revisited: A View Through The Prism Of Transparency, Thomas Keijser, Charles W. Mooney Jr.

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This chapter explains several benefits of adopting transparent information technology systems for intermediated securities holding infrastructures. Such transparent systems could ameliorate various prevailing problems that confront existing tiered, intermediated holding systems, including those related to corporate actions (dividends, voting), claims against issuers and upper-tier intermediaries, loss sharing and set-off in insolvency proceedings, money laundering and terrorist financing, and privacy, data protection, and confidentiality. Moreover, transparent systems could improve the functions of intermediated holding systems even without changes in laws or regulations. They also could provide a catalyst for law reform and a roadmap for substantive content of reforms. Among potential …

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

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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 …

Empirical Law And Economics, Jonah B. Gelbach, Jonathan Klick

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Empirical work has grown in importance in law and economics. This growth coincides with improvements in research designs in empirical microeconomics more generally. In this essay, we provide a stylized discussion of some trends over the last two or three decades, linking the credibility revolution in empirical micro to the ascendancy of empirical work in law and economics. We then provide some methodological observations about a number of commonly used approaches to estimating policy effects. The literature on the economics of crime and criminal procedure illustrates the ways in which many of these techniques have been used successfully. Other fields, …