Public Goods
The Last Whale
The Last Whale is a Public Goods scenario. The core lesson: A shared resource with no owner gets exploited by everyone acting rationally, even when everyone would be better off with restraint. You captain a fleet from one of several nations hunting the same migrating population out on the open ocean, a resource that belongs to no country and answers to no owner. Catches have been falling for years, a sign the population cannot keep up with how fast every fleet is hunting it. DecisionPlay maps the players, payoffs, and equilibrium dynamics that shape how this situation typically resolves.
The situation
You captain a fleet from one of several nations hunting the same migrating population out on the open ocean, a resource that belongs to no country and answers to no owner. Catches have been falling for years, a sign the population cannot keep up with how fast every fleet is hunting it. Your crew's wages depend on this season's haul. You know that if your fleet holds back to let the population recover, nothing stops every other nation's fleet from simply catching what you left behind, leaving the population no better off and your own crew worse off for nothing.
Background
An international body meets periodically to set catch limits, but the limits have been consistently too generous to actually protect the population, and enforcement against any single fleet that exceeds its limit is weak at best. Every captain in every fleet faces the same private incentive: catch as much as possible now, because restraint by you alone changes nothing about how much the population survives.
What this reveals
A resource nobody owns gets treated as if it belongs to no one
When a valuable, regenerating resource has no owner and no enforced limits, every individually rational actor takes as much as possible, since restraint by any one party does not preserve the resource, it simply leaves more for everyone else to take. The population still collapses even though every actor could see it coming.
How to counter it: When you share a resource with others and no enforceable limit exists, look for ways to make restraint binding on everyone at once, since voluntary individual restraint in an unmanaged commons rarely survives contact with everyone else's rational self-interest.
A question to sit with
Have you shared a limited resource, time, credit, budget, with others where nobody wanted to be the one who held back first? What eventually changed the pattern, if anything?
Frequently asked questions
- What game theory concept does The Last Whale illustrate?
- The Last Whale illustrates Public Goods. A shared resource with no owner gets exploited by everyone acting rationally, even when everyone would be better off with restraint.
- What is the situation in The Last Whale?
- You captain a fleet from one of several nations hunting the same migrating population out on the open ocean, a resource that belongs to no country and answers to no owner. Catches have been falling for years, a sign the population cannot keep up with how fast every fleet is hunting it. Your crew's wages depend on this season's haul.
- What does The Last Whale reveal about how people decide?
- A resource nobody owns gets treated as if it belongs to no one. When a valuable, regenerating resource has no owner and no enforced limits, every individually rational actor takes as much as possible, since restraint by any one party does not preserve the resource, it simply leaves more for everyone else to take. The population still collapses even though every actor could see it coming.
- How do you avoid the trap in The Last Whale?
- When you share a resource with others and no enforceable limit exists, look for ways to make restraint binding on everyone at once, since voluntary individual restraint in an unmanaged commons rarely survives contact with everyone else's rational self-interest.
- What is the research behind The Last Whale?
- An international body meets periodically to set catch limits, but the limits have been consistently too generous to actually protect the population, and enforcement against any single fleet that exceeds its limit is weak at best. Every captain in every fleet faces the same private incentive: catch as much as possible now, because restraint by you alone changes nothing about how much the population survives.
- How long does The Last Whale take to play?
- About 6 min, at core difficulty, across 3 decision points. It runs in your browser with no account and no sign-in.
Keep exploring
More Historical Perspective scenarios, or browse all scenarios. New to this? Start with how DecisionPlay works or the game theory glossary.
Topics: public-goods, tragedy-of-the-commons, environment, history