Securities Law Commons^™

Fraud By Hindsight, G. Mitu Gulati, Jeffrey J. Rachlinski, Donald C. Langevoort

Cornell Law Faculty Publications

In securities-fraud cases, courts routinely admonish plaintiffs that they are not permitted to rely on allegations of "fraud by hindsight." In effect, courts disfavor plaintiffs' use of evidence of bad outcomes to support claims of securities fraud. Disfavoring hindsight evidence appears to tap into a well known, well-understood, and intuitively accessible problem of human judgment of "20/20 hindsight." Events come to seem predictable after unfolding, and hence, bad outcomes must have been predicted by people in a position to make forecasts. Psychologists call this phenomenon the hindsight bias. The popularity of this doctrine among judges deciding securities cases suggests that …