Revelation Principle
Updated 2026-08-05
INTRODUCTION
English translation pending.
CORE DEFINITION
The revelation principle states that if a social choice outcome can be implemented by some mechanism, then an equivalent direct revelation mechanism exists in which every participant finds it optimal to report their private information truthfully. The core claim is that this equivalence lets analysts restrict attention to truthful, incentive-compatible mechanisms rather than searching the full space of complex designs. The qualification is that the principle is a modeling result about equilibria, not a claim that people are naturally honest.
SCAFFOLDING EFFECT
Reduce cognitive load
- Truth Induction: Rather than guessing what employees or suppliers think, design a mechanism where honesty is the payoff-maximizing choice. - Direct Mechanism: Second-price auctions work because bidding your true valuation is the dominant strategy. - Design Shortcut: Because any achievable outcome has a truthful equivalent, analysis can focus on incentive-compatible mechanisms.
Anchor fast decisions
If a social choice function can be implemented by any mechanism at all, then there exists a direct revelation mechanism in which truthful reporting is an equilibrium. Because the two are equivalent, the designer can study honest disclosure mechanisms alone without losing any achievable outcome.
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/Revelation_principleverified
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