Negotiation is not only the way lawyers determine what one will pay another in a traditional sale of an asset; it is also the method by which the great share of lawsuits are resolved. Because lying is private activity and because it is often richly rewarded, negotiation is a welcoming environment for a liar. This welcome is enhanced by the fact that deception, short of lying, is permissible and, indeed, at the heart of much negotiation. Worse, because the line between permissible deception and impermissible lying about material matters is indistinct, a liar can readily rationalize his behavior as permissible even when an objective person would find otherwise....