Tragedy of the Commons
When a resource is free for everyone, it risks being depleted for that very reason.
The concept was popularized by ecologist Garrett Hardin in a 1968 article, with roots tracing back to the 19th-century British economist William Forster Lloyd. The classic metaphor is a shared pasture: each herder gains from adding one more animal, while the cost—overgrazing—is shared by everyone. Rational self-interest on the part of each individual leads to the destruction of the whole. This phenomenon applies to all shared and finite resources: fish stocks, the atmosphere, fresh water, and open networks.
A shared breakfast basket at work is always emptied of the best items first. No single person did anything wrong; everyone simply did what was rational for themselves.
Economist Elinor Ostrom, who won the Nobel Prize in 2009, showed that real-world communities often manage their shared resources better than theory predicts—through social norms, agreements, and local governance. The tragedy, therefore, is not inevitable.
The tragedy of the commons is not proof that collective ownership always fails. Ostrom's work demonstrates that well-functioning shared systems are entirely possible.
Identify a 'commons' in your everyday life—a shared coffee machine, a joint calendar. Who maintains it? What happens if no one does?
Shared resources only survive with shared rules.
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