Individual skill
s4h-game-theory-mechanism-design
Designs rules and incentive systems that produce desired outcomes even when players are self-interested. Triggers: 'mechanism design', 'incentive design', 'design a system that makes people do X', 'reverse game theory', 'incentivize honest behavior', 'design rules', 'how do I get people to reveal their true preferences', 'how do I align incentives', 'the current system produces the wrong behavior'.
skills/s4h-game-theory-mechanism-design/SKILL.md
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# Game Theory: Mechanism Design
Standard game theory takes the rules as given and asks what rational players will do. Mechanism design inverts this: it takes the *desired outcome* as given and asks what rules will produce it. This is why it is often called reverse game theory.
The central insight, formalised by Leonid Hurwicz and developed by Eric Maskin and Roger Myerson (who shared the 2007 Nobel Prize), is that private information is the root challenge. Players know things the designer doesn't — their true valuations, their effort levels, their costs — and they have incentives to misrepresent that information if doing so serves them. A well-designed mechanism elicits honest behaviour not by demanding honesty, but by making honesty the dominant strategy: the player's best move given the rules, regardless of what others do.
The revelation principle is the foundational theorem: any equilibrium of any mechanism can be replicated by a *direct incentive-compatible mechanism* — one where each player simply reports their private information truthfully and the rules process it correctly. This means the designer never needs to think about indirect or complicated mechanisms; there is always an honest, direct mechanism that achieves the same outcome.
William Vickrey's second-price auction is the canonical example: by having the winner pay the second-highest bid rather than their own, the dominant strategy becomes truthful bidding. The mechanism extracts honest valuations without demanding or relying on honesty.
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## Your Process
