Ostrom and the commons.

In 1968, the ecologist Garrett Hardin published an essay in *Science* called "The Tragedy of the Commons."

The argument was simple and apparently compelling. Suppose a group of herders shares a common pasture. Each herder benefits from adding another animal to the herd — the benefit is private. But the cost of overgrazing is shared among all herders. Each rational individual therefore has an incentive to add animals until the commons is destroyed. The tragedy is structural: the outcome that is rational for each individual is catastrophic for the group.

Hardin's solution was equally simple: either privatize the commons, giving each herder a personal stake in their patch of land, or impose state control, limiting grazing through regulation. There was no third option. Community self-governance, in Hardin's model, was a fantasy — the institutional equivalent of wishful thinking.

The paper became one of the most cited in all of social science. It influenced a generation of economists, ecologists, and policymakers. It is still taught in introductory courses in economics, political science, and environmental studies.

It was also, in important respects, empirically wrong.

What Ostrom found

Elinor Ostrom was a political scientist at Indiana University who spent her career studying actual institutions for governing shared resources — fisheries, irrigation systems, forests, grazing lands — rather than theoretical models of what rational actors should do.

What she found, across decades of fieldwork on four continents, was that communities had been successfully governing shared resources for centuries without privatizing them and without state control. Swiss alpine farmers had been managing shared mountain pastures since the twelfth century. Spanish irrigation communities had governed shared water rights since medieval times. Japanese fishing villages had maintained sustainable fisheries through community management for hundreds of years.

These communities had not solved the tragedy by eliminating the incentive to defect. They had solved it by building institutions — rules, monitoring systems, enforcement mechanisms, conflict resolution procedures — that changed the payoff structure for individual behavior. The rules were not imposed from outside. They were negotiated within the community, adapted over time, and enforced by community members who had direct stakes in the outcome.

Hardin's model assumed that communities would not do this. Ostrom showed that they often did — and studied the conditions that explained why some communities succeeded and others failed.

The design principles

Ostrom spent years analyzing successful and unsuccessful cases, looking for patterns in what distinguished communities that governed their commons sustainably from those that did not. She distilled her findings into eight design principles, published in *Governing the Commons* (1990):

**Clearly defined boundaries.** Who has rights to use the resource? Who does not? Ambiguity about membership is a precondition for failure.

**Rules fit local conditions.** Effective rules reflect the specific ecology, culture, and history of the resource and the community. Externally imposed rules — even well-designed ones — often fail because they ignore local knowledge that the community possesses and the regulator does not.

**Collective-choice arrangements.** Those who are affected by the rules participate in modifying them. Rules imposed without participation tend to be resisted, evaded, and ultimately ignored.

**Effective monitoring.** Someone monitors both the resource and the behavior of the users. In successful cases, users often monitor each other — which is cheaper than external monitoring and produces more accurate information.

**Graduated sanctions.** Rule violations are met with graduated responses, starting with mild sanctions for first offenses and escalating for repeated violations. Harsh sanctions for first offenses destroy cooperation; no sanctions invite exploitation.

**Conflict resolution mechanisms.** When disputes arise — over resource use, rule interpretation, or allocation — there is a legitimate, low-cost mechanism for resolving them. Communities without conflict resolution mechanisms fragment under the pressure of inevitable disagreements.

**Minimal recognition of rights.** External governments recognize the community's right to organize its own governance. Communities whose institutions are constantly threatened by external authority cannot build the stable expectations that governance requires.

**Nested enterprises.** For larger systems, governance is organized in nested layers, with smaller units handling local issues and larger units handling issues that extend beyond local boundaries.

Hardin's paper had treated the commons problem as insoluble without external intervention. Ostrom showed that communities had been solving it for centuries, and identified the institutional conditions under which they succeeded.

The Nobel Prize and what it recognized

Ostrom won the Nobel Prize in Economics in 2009 — the first woman to do so — for "her analysis of economic governance, especially of the commons."

The award was significant not only for what it recognized but for what it implicitly rejected. The Nobel committee was honoring a body of work that challenged two of the most powerful assumptions in mainstream economics: that rational actors will always defect in collective action problems, and that the only solutions are private property or state regulation.

Ostrom did not argue that community governance always works. She was precise about the conditions it requires — and honest about the cases in which it fails. The commons she studied were bounded resources with identifiable user communities. Global commons — the atmosphere, the deep ocean — present harder problems, where the users cannot monitor each other and the community is effectively the entire human population. Her design principles don't directly solve climate change.

What they do is establish something more fundamental: that institutional design matters. That the rules communities use to govern shared resources are not random outcomes of culture or luck — they can be analyzed, compared, evaluated, and deliberately improved. That governance is a domain of knowledge, not just of authority.

Why this matters for civic experimentation

Ostrom's work is directly relevant to the ES model in three ways.

First, it provides the intellectual grounding for polycentric governance — the idea that good governance does not require centralized authority, that multiple overlapping institutions learning in parallel can outperform a single large institution trying to optimize globally. Ostrom's commons communities are exactly what polycentric governance looks like in practice.

Second, it establishes that local knowledge is not an obstacle to governance — it is a resource. Her communities governed successfully in part *because* the rules were adapted to local conditions that external regulators couldn't know. The Swiss alpine rules that specify how many cattle a herder can graze are calibrated to the precise ecology of specific alpine meadows. No central authority could have designed rules that good. The community designed them because it had the knowledge that the central authority lacked.

Third, and most directly: Ostrom shows that institutions can be studied as experiments. The successful commons communities she analyzed were not the product of genius design — they evolved through iterations of trial, failure, and adaptation over decades or centuries. The design principles she extracted are, in effect, what worked across a large sample of natural experiments in institutional governance.

What The Experiment Society proposes is to speed up that process — to make the iteration deliberate rather than accidental, to make the learning explicit rather than tacit, and to make the findings shared rather than trapped within a single community.

Ostrom's lifetime of fieldwork is a case for why that kind of institutional learning is possible. The evidence is historical rather than experimental. But the lesson is the same one that runs through the entire intellectual tradition ES draws on: institutions that learn from their own experience, adapt their rules to fit local conditions, and build mechanisms for correction and conflict resolution tend to survive and thrive. Institutions that do not, tend not to.

Next issue: What the UK Nudge Unit proved about the possibility of experimental government.