Robust combinatorial auction protocol against false-name bids.
Artificial Intelligence
Telling humans and computers apart automatically
Communications of the ACM - Information cities
False-name-proof combinatorial auction protocol: Groves Mechanism with SubModular Approximation
AAMAS '06 Proceedings of the fifth international joint conference on Autonomous agents and multiagent systems
Limited verification of identities to induce false-name-proofness
TARK '07 Proceedings of the 11th conference on Theoretical aspects of rationality and knowledge
Revenue monotonicity in combinatorial auctions
AAAI'07 Proceedings of the 22nd national conference on Artificial intelligence - Volume 1
IJCAI'03 Proceedings of the 18th international joint conference on Artificial intelligence
CAPTCHA: using hard AI problems for security
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Complexity of mechanism design
UAI'02 Proceedings of the Eighteenth conference on Uncertainty in artificial intelligence
WINE '08 Proceedings of the 4th International Workshop on Internet and Network Economics
Pseudonyms in Cost-Sharing Games
WINE '09 Proceedings of the 5th International Workshop on Internet and Network Economics
Decision rules and decision markets
Proceedings of the 9th International Conference on Autonomous Agents and Multiagent Systems: volume 1 - Volume 1
False-name-proofness with bid withdrawal
Proceedings of the 9th International Conference on Autonomous Agents and Multiagent Systems: volume 1 - Volume 1
Comparing multiagent systems research in combinatorial auctions and voting
Annals of Mathematics and Artificial Intelligence
False-name-proofness in social networks
WINE'10 Proceedings of the 6th international conference on Internet and network economics
Mechanisms for multi-level marketing
Proceedings of the 12th ACM conference on Electronic commerce
Cloning in elections: finding the possible winners
Journal of Artificial Intelligence Research
Proof systems and transformation games
Annals of Mathematics and Artificial Intelligence
Sybil-proof mechanisms in query incentive networks
Proceedings of the fourteenth ACM conference on Electronic commerce
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One way for agents to reach a joint decision is to vote over the alternatives. In open, anonymous settings such as the Internet, an agent can vote more than once without being detected. A voting rule is false-name-proof if no agent ever benefits from casting additional votes. Previous work has shown that all false-name-proof voting rules are unresponsive to agents' preferences. However, that work implicitly assumes that casting additional votes is costless. In this paper, we consider what happens if there is a cost to casting additional votes. We characterize the optimal (most responsive) false-name-proofwith-costs voting rule for 2 alternatives. In sharp contrast to the costless setting, we prove that as the voting population grows larger, the probability that this rule selects the majority winner converges to 1. We also characterize the optimal group false-name-proof rule for 2 alternatives, which is robust to coalitions of agents sharing the costs of additional votes. Unfortunately, the probability that this rule chooses the majority winner as the voting population grows larger is relatively low. We derive an analogous rule in a setting with 3 alternatives, and provide bounding results and computational approaches for settings with 4 or more alternatives.