But, if this general line of reasoning is valid, any analysis of explicit bargaining must pay attention to what we might call the “communication” that is inherent in the bargaining situations, the signals that the participants read in the inanimate details of the case. And it means that tacit and explicit bargaining are not thoroughly separate concepts but that the various gradations from tacit bargaining up through types of incompleteness or faulty or limited communication to full communication all show some dependence on the need to coordinate expectations. Hence all show some degree of dependence of the participants themselves on their common inability to keep their eyes off certain outcomes.

Thomas C. Schelling, The Strategy of Conflict, loc. 186