Antitrust & Competition Policy Blog

Editor: D. Daniel Sokol
University of Florida
Levin College of Law

Tuesday, February 13, 2018

TO POOL OR NOT TO POOL: A CLOSER LOOK AT THE USE OF SUB-REGRESSIONS IN ANTITRUST CLASS CERTIFICATION

Ai Deng, Bates White asks TO POOL OR NOT TO POOL: A CLOSER LOOK AT THE USE OF SUB-REGRESSIONS IN ANTITRUST CLASS CERTIFICATION.

ABSTRACT: Did the anticompetitive conduct in question impact all or nearly all class members? This is a question central to a court’s class certification decision. To answer this question, a methodology—known as sub-regressions—is being increasingly employed, particularly by defendants’ expert witnesses. A key step of a sub-regression type analysis is to partition the data into various subgroups and then to examine data poolability. In this article, I focus on three areas of interest pertaining to sub-regressions. First, I review the related law and economics literature related to this methodology. I then analyze courts’ recent class certification decisions in cases where parties introduced sub-regression analysis. I then discuss several methodological challenges, many of which have not been previously acknowledged, and present potential ways to address these challenges. I emphasize that a disciplined and rigorous implementation is crucial for the reliability of sub-regressions.

http://lawprofessors.typepad.com/antitrustprof_blog/2018/02/to-pool-or-not-to-pool-a-closer-look-at-the-use-of-sub-regressions-in-antitrust-class-certification.html

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