The Prisoner's Dilemma
Two people who would both be better off cooperating each have a private reason to defect — and end up worse off together. It is the most famous trap in strategy.
Two suspects are questioned in separate rooms. If both stay silent, both get off lightly. If one talks, the talker walks free and the silent one pays dearly. If both talk, both pay heavily. Each reasons the same way: whatever the other does, talking serves me better. So both talk — and both lose.
The trap is that individual logic and group logic point in opposite directions. Neither player is stupid or wicked; the payoffs themselves reward defection, and the bad ending follows from everyone being sensible.
It is everywhere once you see it: two colleagues who could share credit but each grab it, two shops that could hold prices but discount each other into a war, two roommates who could both clean but each wait the other out.
The lesson is not that people are selfish. It is that some situations are built to punish trust — and the fix is to change the situation, not to lecture the players.
Escape the trap
Name the dilemma out loud
When both sides are drifting toward mutual defection, say what is happening: 'if we both play it safe, we both lose.' Making the structure visible is the first move out of it.
Change the payoffs, not the people
Add something that makes defection expensive or cooperation rewarding: a shared deadline, a public agreement, a small deposit each side forfeits by walking away.
- What would make betraying me cost more than it pays?
Make it repeated
One-shot games invite defection. Turn a single transaction into an ongoing relationship — future rounds give both sides a reason to behave in this one.
When sensible people keep producing a senseless outcome, stop blaming the players and look at the game.