Insurance schemes permit the sharing of interests; the insurance company has a different incentive structure from the insured party and may be better able to make threats or resist them for that reason. Requiring several signatures on a check accomplishes a similar purpose. The use of a professional collecting agency by a business firm for the collection of debts is a means of achieving unilateral rather than bilateral communication with its debtors and of being therefore unavailable to hear pleas or threats from the debtors. Providing ammunition to South Korean troops or giving them access to prisoner-of-war camps so that they can unilaterally release prisoners is a tactical means of relinquishing an embarrassing power of decision—embarrassing because it subjects one to coercive or deterrent threats or leaves one the capacity to back out of his own threat, hence the incapacity to make the threat persuasive.

Thomas C. Schelling, The Strategy of Conflict, loc. 330