Tragedy of the Commons: The Concise Encyclopedia of Economics | Library of Economics and Liberty - 0 views
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Ihering Alcoforado on 08 Oct 10Tragedy of the Commons by Garrett Hardin About the Author Search CEE Home | CEE | 2nd edition | Tragedy of the Commons In 1974 the general public got a graphic illustration of the "tragedy of the commons" in satellite photos of the earth. Pictures of northern Africa showed an irregular dark patch 390 square miles in area. Ground-level investigation revealed a fenced area inside of which there was plenty of grass. Outside, the ground cover had been devastated. The explanation was simple. The fenced area was private property, subdivided into five portions. Each year the owners moved their animals to a new section. Fallow periods of four years gave the pastures time to recover from the grazing. The owners did this because they had an incentive to take care of their land. But no one owned the land outside the ranch. It was open to nomads and their herds. Though knowing nothing of Karl Marx, the herdsmen followed his famous advice of 1875: "To each according to his needs." Their needs were uncontrolled and grew with the increase in the number of animals. But supply was governed by nature and decreased drastically during the drought of the early 1970s. The herds exceeded the natural "carrying capacity" of their environment, soil was compacted and eroded, and "weedy" plants, unfit for cattle consumption, replaced good plants. Many cattle died, and so did humans. The rational explanation for such ruin was given more than 170 years ago. In 1832 William Forster Lloyd, a political economist at Oxford University, looking at the recurring devastation of common (i.e., not privately owned) pastures in England, asked: "Why are the cattle on a common so puny and stunted? Why is the common itself so bare-worn, and cropped so differently from the adjoining inclosures?" Lloyd's answer assumed that each human exploiter of the common was guided by self-interest. At the point when the carrying capacity of the commons was fully reached, a herdsman might ask himsel