The bystander who jumps into an intersection and begins to direct traffic at an impromptu traffic jam is conceded the power to discriminate among cars by being able to offer a sufficient increase in efficiency to benefit even the cars most discriminated against; his directions have only the power of suggestion, but coordination requires the common acceptance of some source of suggestion.

DEFINE: Explains how coordination and suggestion function in traffic contexts, illustrating a broader principle about power and consensus.

Thomas C. Schelling, The Strategy of Conflict, loc. 334