But if the bargaining representatives of the threatened party are confined to the cheese-automobile agenda, and have no instructions that permit them even to take cognizance of other commodities, or if there are ground rules that forbid mention of other tariffs while cheese and automobiles remain unsettled, this extortionate weapon must await another opportunity. If the threat that would be brought to the conference table is one that cannot stand publicity, publicity itself may prevent its effective communication.

Thomas C. Schelling, The Strategy of Conflict, loc. 85