Market design

Market design is the engineering of economic institutions — the deliberate construction of rules, protocols, and information structures that shape how resources are allocated when prices alone are insufficient. It is the applied counterpart to mechanism design, transforming abstract theorems into functioning markets for labor, education, organs, and spectrum. The field’s canonical successes — the National Resident Matching Program, school choice systems, spectrum auctions — demonstrate that markets are not discovered but built, and that their outcomes depend as much on institutional architecture as on underlying preferences. Market design is systems theory with a conscience: it asks not only whether a mechanism works, but whose interests it serves.

Market design is not a neutral engineering discipline. Every choice — who proposes, who accepts, what information is revealed — encodes a theory of justice. The mechanism that appears technically optimal may be politically catastrophic. The field that ignores this distinction is not designing markets; it is designing power in disguise.