In the fall, I posted on Professor Kevin R. Douglas’s article, “How Creepy Concepts Undermine Effective Insider Trading Reform” (linked below), which is now forthcoming in the Journal of Corporation Law. The following post comes from Professor Douglas. In it, he develops one theme from that article:

Would U.S. officials imprison real people for failing to adhere to the most unrealistic assumptions in prominent economic models? Yes, if the assumption is that no one can generate risk-free profits when trading in efficient capital markets. What are risk-free profits, and why should you go to jail for trying to generate them? Relying on the ordinary dictionary definition of “risk” makes the justification for criminal penalties described above seem absurd. One dictionary defines risk as “the possibility of loss, injury, or other adverse or unwelcome circumstance,” and another simply defines risk as “the possibility of something bad happening.” Why should someone face criminal liability for attempting to generate trading profits without something bad happening—without losing money? The absurdity is especially jarring when thinking about securities markets, where hedge fund managers rely heavily on risk reduction strategies.

However, if we turn to the definition of “risk” used in prominent models…