Unscrupulous Diner's Dilemma
Updated 2026-08-01
INTRODUCTION
English translation pending.
CORE DEFINITION
A multiplayer version of the prisoner's dilemma and a microcosm of the tragedy of the commons. When a bill is shared equally, the marginal cost of an extra dish falls to one over the number of diners, while the full pleasure of eating it stays private. Every rational diner therefore upgrades their order, and the group ends up spending more per head than any of them would have chosen voluntarily. The structure, not the character of the diners, produces the outcome.
SCAFFOLDING EFFECT
Reduce cognitive load
- Shared-cost diagnosis: check whether a pooled budget lets each person shift cost onto the group. - Quota design: cap individual claims before the pool is opened, not after. - Expense audit: read rising reimbursement as a structure problem, not a morals problem.
Anchor fast decisions
Pooling the bill turns a private purchase into a partly public one: the diner captures all the benefit of an expensive dish but pays only a fraction of its cost. Rational self-interest then pushes every participant to order up, and the sum of individually sensible choices is a bill nobody wanted. The same arithmetic drives over-consumption of any shared resource, from team budgets to welfare pools.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Unscrupulous_diner's_dilemmaverified
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