The Commons We Keep Losing: From Grazing Land to Groundwater to Data

The phrase “tragedy of the commons” has become one of those ideas that feels like common sense the moment you hear it. Put a pasture in the hands of many herders, the story goes, and each will graze one more animal than his share, because the gain is his alone while the cost of the ruined grass is spread across everyone. Multiply that selfishness by a whole village and the field is stripped bare. Shared things, the argument concludes, are doomed things — and the only way to save them is to fence them, own them, or hand them to the state. It is a tidy, memorable, and enormously influential idea. It is also, in the form most people repeat it, wrong. And the gap between the tidy version and the messy truth is one of the most consequential misunderstandings of the last century.

I want to walk through where the idea came from, why a Nobel laureate spent her career dismantling it, and how a flawed metaphor about grazing sheep ended up as an all-purpose justification for taking things that used to belong to everyone. Because once you see the pattern, you start seeing it everywhere — in groundwater and fisheries, yes, but also in your attention, your data, and the accumulated knowledge of the species. The commons we keep losing are not being lost to some natural law. They are being taken, and the metaphor is part of how the taking gets excused.

The standard story

The modern version comes from a 1968 essay in the journal Science by the ecologist Garrett Hardin, titled “The Tragedy of the Commons.” Hardin was writing about population growth, but the image he used to carry his argument is what survived. He asked his readers to picture a pasture open to all. Each herder, acting rationally in his own interest, adds animals until the land collapses. “Freedom in a commons brings ruin to all,” he wrote, in a line that has been quoted ever since. His prescription was blunt: shared resources must be brought under control, whether through private property or state coercion, because voluntary restraint would always be defeated by the one person willing to cheat.

It landed with the force of a natural law. Here, apparently, was a mathematical proof that sharing does not scale — that human beings, left to manage anything together, will inevitably wreck it. Economists cited it. Policy schools taught it. Development banks leaned on it to justify converting communal land to private title across Africa, Asia, and Latin America. For anyone who wanted to privatise a forest, drain a wetland, or dissolve a village’s customary rights over its own fields, Hardin had handed them a respectable-sounding reason: we are not seizing this, we are rescuing it from itself.

The rebuttal that won a Nobel Prize

There was a problem, and it took a political scientist named Elinor Ostrom to name it clearly. Hardin had not actually described a commons. He had described an open-access resource — a free-for-all with no rules, no membership, and no one able to exclude a newcomer or sanction a cheat. A real commons, the kind that has existed for centuries, is almost the opposite: a bounded community managing a shared resource under a dense web of its own rules about who may take what, when, and how much.

Ostrom spent decades gathering the evidence Hardin never bothered to look for. She and her colleagues studied Swiss alpine pastures that villagers had grazed communally since the Middle Ages without stripping them bare; Japanese village forests governed by detailed customary law; irrigation systems in Spain and the Philippines where farmers had allocated scarce water among themselves for generations; inshore fisheries where the fishing families themselves set the limits. In case after case she found the thing Hardin’s model said was impossible: ordinary people, without privatisation and without a state forcing them, sustaining a shared resource across lifetimes.

Hardin had not described a commons at all. He had described a free-for-all with no rules — and then blamed the sharing for the ruin.

Her 1990 book Governing the Commons laid out what these successful systems had in common: clear boundaries about who belonged, rules matched to local conditions, the people affected having a hand in making the rules, monitoring, graduated penalties for those who broke them, cheap ways to resolve disputes, and enough recognition from higher authorities to be left alone. These were not utopias, and Ostrom was careful never to romanticise them; plenty of commons have failed. Her point was narrower and more devastating: collapse is not inevitable, self-governance is real and common, and the choice between “privatise it” and “let the government run it” is a false one that ignores the third option humans have used for most of history. In 2009 she became the first woman to win the Nobel Memorial Prize in Economics, largely for this work. The discipline that had treated Hardin’s parable as settled had to reckon with the fact that its central assumption was empirically shaky.

How a metaphor became a weapon

It is worth being fair to Hardin, and also honest about him. His essay raised a genuine problem: unmanaged shared resources really can be destroyed by uncoordinated overuse, and pollution — where the “commons” is the air or water we dump into — fits his model uncomfortably well. That part has held up. But Hardin’s later writing drifted into territory that has drawn heavy and deserved criticism: he opposed immigration and food aid on population-control grounds and expressed views that many read as nativist. The essay does not require those conclusions, but they are part of why modern scholars handle it with tongs, and why it is worth separating the useful kernel from the man and his politics.

The deeper trouble is what the metaphor was used for. Strip away the herders and the sheep, and Hardin’s argument became a template: declare that a shared resource is being wrecked by the very fact of its being shared, and the fence starts to look like a favour. That template has a long history, one I’ve traced in the enclosure of the commons in England, where over three centuries roughly half the country’s farmland was converted from common right to private property, and the people who had lived off it were turned into tenants and wage-labourers. The enclosers, too, said they were improving the land, rescuing it from waste and inefficiency. The improvement was real; so was the dispossession. The commons were not failing. They were profitable to take.

This is the through-line I keep returning to. The recurring move — call it capture, call it enclosure — is not to steal something openly. It is to first declare that the thing is doomed, mismanaged, or worthless in common hands, and then to step in as the rescuer who fences it and keeps the value. Hardin’s parable is so useful to that move because it supplies the opening line for free. It tells us the commons was going to die anyway.

A sweep of what we keep losing

Once you hold the pattern in your hand, the history of the commons stops looking like a series of unrelated losses and starts looking like one long campaign. Consider the range.

• Grazing land and forests. The classic commons — pastures, woods, and rough ground held by villages — were among the first to go, in England and then wherever colonial administrators imposed private title on communal land, often dismissing functioning local systems as chaos because they did not look like European property.
• Groundwater. Beneath farms from California to Punjab to the North China Plain, aquifers that took millennia to fill are being pumped faster than rain can replace them, each well-owner rationally racing the others to the bottom. This is Hardin’s nightmare made literal — and Ostrom’s Southern California groundwater studies showed that some basins solved it, precisely by building the institutions Hardin said could not exist.
• Fisheries. The open ocean is close to a true open-access resource, and many stocks have been fished toward collapse. But where fishing communities have been granted secure, shared rights and a say in the rules, they have often rebuilt what unmanaged competition was destroying.
• The atmosphere. The largest commons of all is the one we treat as a free dump for carbon, with the costs spread across every future person and the benefits pocketed now. It is the hardest case, because the community is the whole species and the rules barely exist.

And then there are the new commons, the ones Hardin never imagined, where the same script is running in real time.

The commons we keep losing are not lost to a law of nature. They are taken — and the metaphor is part of how the taking gets excused.

Data is the clearest example. The record of human behaviour — what we buy, where we go, who we know, what we say — was never anyone’s property until it was quietly enclosed by the platforms that harvest it. Attention is another: a shared human capacity that has been fenced, metered, and sold to the highest bidder by an industry engineered to capture it. Knowledge itself — scientific research, much of it publicly funded, and the accumulated culture of the species — keeps getting locked behind paywalls, patents, and proprietary models trained on the open web and then closed. In each case the enclosure follows the familiar shape, which is why I’ve argued separately about how technology gets captured: a resource that grew up open and shared is reframed as ungovernable or unmonetised, and someone arrives to put a gate on it.

A ten-thousand-year enclosure

Step back far enough and this is not a story about the twentieth century at all. It runs back to the moment humans first stored a surplus. When I looked at how farming invented inequality, the hinge was the same: the granary, the storable surplus, the first thing worth fencing and guarding — and with it the first people positioned to control access to what everyone needed. The commons and its enclosure are two halves of a single, very old machine, and it has been running for something like ten thousand years. What changes is only the resource on the table: the field, the forest, the water, and now the dataset and the feed.

What Ostrom gives us is not naive optimism but something more useful: proof that the ending is not written. If shared resources were truly condemned by human nature, the alpine villages would have starved out their pastures centuries ago and the Spanish irrigators would have drained their canals dry. They did not, because they built rules, watched each other, and kept the value in common hands. The tragedy Hardin described is real, but it is the tragedy of the unmanaged and the ungoverned — and, just as often, the tragedy of a commons deliberately stripped of its rules so that it can be taken.

So when someone tells you a shared thing must be fenced for its own good — your data, the public airwaves, a fishery, a body of knowledge — it is worth asking the two questions the parable was designed to make you skip. Was this actually an ungoverned free-for-all, or a working commons with rules that were inconvenient to someone? And who, exactly, ends up owning it once the fence goes up? The answers are rarely the ones the metaphor supplies. The commons is not doomed. It is contested. And it has been for a very long time.