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Multiagent Systems

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of. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 305/731<br />

4. Decision Making (2) 2. Tactical Voting<br />

We call a social correspondence strategy-proof, if it is<br />

best for each agent to choose its preferences truthfully:<br />

deviating does not pay off.<br />

Gibbard/Satterthwaite<br />

If a social correspondence is strategy-proof and each<br />

outcome is in principle votable, then there is a dictator.<br />

The original theorem was based on total orders. The<br />

stronger version here is due to Pini/Rossi/Venable/Walsh<br />

(AAMAS 2006).

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