The Tragedy of the Commons

The tragedy of the commons describes how shared resources can be depleted through individual self-interest. The classic illustration involves herders grazing their cattle on a communal pasture. Each herder gains by adding another animal, while the cost of overgrazing is borne collectively. Rational decisions at the individual level thus culminate in collective ruin. The concept has since been applied to overfishing, deforestation, and atmospheric pollution. Conventional wisdom held that only privatisation or strict government control could avert disaster. The economist Elinor Ostrom challenged this assumption with meticulous fieldwork around the world. She documented communities that had sustainably managed fisheries and forests for centuries. Their success hinged on trust, clearly defined rules, and the ability to sanction those who cheated.