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Does The Efficient Market Theory Help Us Do Justice In A Time Of Madness, William O. Fisher

Law Faculty Publications

This Article questions how well the efficient market theory, as applied by event studies, works in cases originating during the Internet, high-tech, and telecommunications bubble of 1998 to 2001. In doing so, the Article discusses technical and theoretical challenges to the efficient market theory. Principally, however, this Article argues that the use of the efficient market theory-and relatedly the event study methodology-is inappropriate in bubble cases for normative reasons. The normative connection between the efficient market theory-applied through event studies-and the lOb-5 elements-reliance, materiality, loss causation, and damages-presupposes that the market acts rationally. Market professionals supposedly impose that rationality through …