Market Efficiency

Market Efficiency

How Efficient Is Sufficient: Applying the Concept of Market Efficiency in Litigation     Bradford Cornell and John Haut, 74(2) 417-434 (Spring 2019)
The concept of market efficiency has been adopted by courts in a variety of contexts. In reality, markets can never be perfectly efficient or inefficient, but exist somewhere in between depending on the facts and circumstances. Courts, therefore, face a problem in deciding how efficient is sufficient in any particular legal context. Because market prices incorporate the views of numerous market participants, courts have often been willing to presume that a market is efficient so long as the appropriate criteria are satisfied. However, those criteria are different for different types of cases, such as securities class actions, appraisal actions, and cram downs in bankruptcy.

Asking the Right Question: The Statutory Right of Appraisal and Efficient Markets
     Jonathan Macey and Joshua Mitts, 74(4): 1015-1064
(Fall 2019)
In this article, we make several contributions to the literature on appraisal rights and similar cases in which courts assign values to a company’s shares in the litigation context. First, we applaud the recent trend in Delaware cases to consider the market prices of the stock of the company being valued if that stock trades in an efficient market, and we defend this market-oriented methodology against claims that recent discoveries in behavioral finance indicate that share prices are unreliable due to various cognitive biases. Next, we propose that the framework and methodology for utilizing market prices be clarified. We maintain that courts should look at the market price of the securities of a target company whose shares are being valued, unadjusted for the news of the merger, rather than at the deal price that was reached by the parties in the transaction.