Alternatives to truthfulness are hard to recognize

Abstract. The central question in mechanism design is how to implement a given social choice function. One of the most studied concepts is that of truthful implementations in which truth-telling is always the best response of the players. The Revelation Principle says that one can focus on truthful implementations without loss of generality (if there is no truthful implementation then there is no implementation at all). Green and Laffont [1] showed that, in the scenario in which players’ responses can be partially verified, the revelation principle holds only in some particular cases. When the Revelation Principle does not hold, non-truthful implementations become interesting since they might be the only way to implement a social choice function of interest. In this work we show that, although non-truthful implementations may exist, they are hard to find. Namely, it is NP-hard to decide if a given social choice function can be implemented in a non-truthful manner, or even if it ca...

• Type: Journal
• Year: 2011
• Where: AAMAS
• Authors: Vincenzo Auletta, Paolo Penna, Giuseppe Persiano, Carmine Ventre
• Keywords: AAMAS 2011, Intelligent Agents, Revelation Principle, Social Choice Functions, Truthful Implementation