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What is the tragedy of the commons?

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Quick answer

The tragedy of the commons is when individuals, each acting in their own interest, overuse a shared resource until it's ruined for everyone. Think of a shared pasture overgrazed because each herder keeps adding just one more animal. A resource is shared and open to all (a pasture, fishery, or the atmosphere).

Key things to understand

  1. A resource is shared and open to all (a pasture, fishery, or the atmosphere).
  2. Each person gains by using a bit more, but the cost is shared by all.
  3. Everyone follows that logic, so the resource gets depleted or destroyed.
  4. No single user has an incentive to hold back alone.
  5. Solutions include rules, ownership, or cooperation.

People also ask

What is an example of the tragedy of the commons?
Overfishing: each boat profits by catching more, but together they collapse the fish stock everyone depends on.
Why does it happen?
Each user gets the full benefit of taking more while the cost is spread across everyone, so individually it always seems worth it.
How can the tragedy of the commons be prevented?
Through shared rules, quotas, taxes, private ownership, or community agreements that align individual incentives with the group's.