Explaining Deviations from the Fifty-Percent Rule: A Multimodal Approach to the Selection of Cases for Litigation

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Abstract
In their 1984 article, Priest and Klein show that a simple divergent expectations model of the decision to litigate leads to a plaintiff success rate at trial that approaches 50 percent as the fraction of cases going to trial approaches zero. However, an extensive empirical literature has documented that plaintiffs win far fewer than half of their cases. As Priest and Klein observe, this conflict between the predictions of the model and the empirical literature may be attributable to violations in the data of the assumptions behind the simple model. Based on data from 3,529 cases, we find that "multimodal" case characteristics associated with violations of these assumptions cause plaintiff win rates to deviate from the 50-percent baseline in the manner that simple law-and-economics models would suggest. In other words, among cases that conform more closely to the assumptions underlying the simple divergent expectations model, the plaintiff win rate is closer to 50 percent.

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