Rules, Games, and Common-Pool Resources

The book argues that non-cooperative game theory's prediction of inevitable resource destruction in common-pool settings is empirically incomplete. Through laboratory experiments and field studies, the authors demonstrate that when appropriators can communicate face-to-face and devise their own rules, they frequently achieve outcomes far more cooperative than game-theoretic models predict. The core insight is that institutions—rules crafted by users themselves—alter the structure of the game, changing incentives and enabling sustainable appropriation. The book rejects the assumption that external coercion or privatization is the only path to avoiding the tragedy of the commons.

Governing the Commons (1990) relied primarily on field cases to demonstrate that self-governance can work. Rules, Games, and Common-Pool Resources (1994) adds a rigorous experimental component: controlled laboratory games that test game-theoretic predictions under varying conditions. The later book also formalizes the Institutional Analysis and Development framework more systematically, providing the analytical language for coding rules and action situations. Together, they form a complementary pair—one showing that communities can govern themselves, the other testing the mechanisms under controlled conditions and providing the diagnostic tools.

The experiments showed that face-to-face communication dramatically increases cooperation rates in common-pool resource games. Without communication, subjects over-appropriate as predicted by non-cooperative game theory. With communication, they often agree on restraint and achieve near-optimal outcomes. The authors also tested sanctioning institutions, finding that when users can impose graduated sanctions on rule-breakers, cooperation is sustained even when sanctioning is costly. These findings challenged the assumption that rational actors will always free-ride and demonstrated that communication and endogenous enforcement are powerful mechanisms for overcoming social dilemmas.

The Institutional Analysis and Development (IAD) framework provides the diagnostic structure for examining how rules, physical conditions, and community attributes jointly shape action situations. The book identifies seven working parts of an action situation—participants, positions, actions, outcomes, transformation functions, information, and payoffs—and shows how rules configure each component. This framework allows systematic comparison across laboratory settings and field cases, from irrigation systems to fisheries. It became the foundational methodology for the Bloomington School and is widely used in policy analysis, development studies, and resource governance research.

The authors do not claim self-governance always succeeds. Field chapters document cases where local institutions broke down—fisheries in Turkey and Sri Lanka, groundwater basins in California, irrigation systems in Nepal. They attribute failures to changed technology, population growth, and counterproductive intervention by national governments that overrode effective local arrangements. The key insight is that institutions must fit local conditions; when external forces disrupt the fit between rules and biophysical or social context, previously successful self-governance can collapse. This nuanced treatment distinguishes the book from romanticized accounts of community management.

A frequent misreading is that Ostrom and colleagues reject game theory outright. They do not. Instead, they use non-cooperative game theory as a benchmark to identify where its predictions fail, then explain those failures through institutional analysis. The book treats game theory as a valuable diagnostic tool, not a complete explanation of human behavior. The authors critique the assumption of full rationality and the treatment of rules as external and fixed. Their contribution is to show that when rules are endogenous—crafted and revised by players themselves—game-theoretic predictions require substantial revision.