Coordination Problems: Why Aligning Choices Can Matter More Than Which Choice
In a coordination game, players do better when their choices match, regardless of which option they jointly pick. Such games have multiple equilibria, and the practical challenge is selecting one — often solved by conventions, focal points, or social norms rather than by communication.
A coordination problem arises in game theory when two or more parties get a better outcome by making mutually consistent choices than by acting at cross purposes — and often it matters far more *that* they align than *which* option they align on. In a pure coordination game, every party is indifferent among the matched outcomes; what they cannot afford is a mismatch. The classic example is which side of the road to drive on: left or right is arbitrary, but everyone choosing the same side is essential. Formally these games have multiple Nash equilibria, each corresponding to a consistent set of choices. Because no single equilibrium is uniquely 'correct,' the real difficulty is equilibrium selection — getting everyone to expect the same one without necessarily being able to communicate. Thomas Schelling described how players converge on a focal point (a Schelling point): an option that stands out as salient, more obvious, fairer, or safer, and so becomes the natural meeting place of expectations. Variants add structure. The stag hunt (assurance game) pits a high-payoff cooperative choice that requires trust against a safe independent fallback. The battle of the sexes is a coordination game where the parties prefer to coordinate but rank the matched outcomes differently, introducing a distributional conflict on top of the coordination need. The enduring solution to recurring coordination problems is a convention or social norm — a de facto standard that lets everyone anticipate everyone else's choice. Driving sides, measurement units, file formats, and language are all conventions that resolve coordination problems by making one equilibrium the expected default. Coordination problems are distinct from problems like the prisoner's dilemma, where the obstacle is conflicting incentives rather than the difficulty of aligning compatible ones.