But in a nonzero-sum game that involves any initial uncertainty over which among the possible outcomes are in fact efficient and any need for coordinated mutual accommodation to get to an efficient outcome, a rational player cannot absent himself in self-defense from the social process; he cannot turn off his hearing aid to avoid being constrained by what he hears, if complete radio silence makes efficient collaboration impossible. Nor can he rationally fail to open a letter, once it is delivered, since the other party will have assumed that he will open it and have acted accordingly.

Thomas C. Schelling, The Strategy of Conflict, loc. 370