Complexity of manipulating elections with few candidates
Eighteenth national conference on Artificial intelligence
How many candidates are needed to make elections hard to manipulate?
Proceedings of the 9th conference on Theoretical aspects of rationality and knowledge
Universal voting protocol tweaks to make manipulation hard
IJCAI'03 Proceedings of the 18th international joint conference on Artificial intelligence
IJCAI'05 Proceedings of the 19th international joint conference on Artificial intelligence
Small coalitions cannot manipulate voting
FC'05 Proceedings of the 9th international conference on Financial Cryptography and Data Security
AMEC'05 Proceedings of the 2005 international conference on Agent-Mediated Electronic Commerce: designing Trading Agents and Mechanisms
Journal of Computer and System Sciences
When are elections with few candidates hard to manipulate?
Journal of the ACM (JACM)
Computing the Banzhaf power index in network flow games
Proceedings of the 6th international joint conference on Autonomous agents and multiagent systems
Power in threshold network flow games
Autonomous Agents and Multi-Agent Systems
Nonexistence of voting rules that are usually hard to manipulate
AAAI'06 Proceedings of the 21st national conference on Artificial intelligence - Volume 1
Llull and copeland voting broadly resist bribery and control
AAAI'07 Proceedings of the 22nd national conference on Artificial intelligence - Volume 1
Approximability of manipulating elections
AAAI'08 Proceedings of the 23rd national conference on Artificial intelligence - Volume 1
Multi-winner elections: complexity of manipulation, control, and winner-determination
IJCAI'07 Proceedings of the 20th international joint conference on Artifical intelligence
Economies with non-convex production and complexity equilibria
Proceedings of the 12th ACM conference on Electronic commerce
Voting in cooperative information agent scenarios: use and abuse
CIA'06 Proceedings of the 10th international conference on Cooperative Information Agents
The distortion of cardinal preferences in voting
CIA'06 Proceedings of the 10th international conference on Cooperative Information Agents
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Encouraging voters to truthfully reveal their preferences in an election has long been an important issue. Previous studies have shown that some voting protocols are hard to manipulate, but predictably used NP-hardness as the complexity measure. Such a worst-case analysis may be an insufficient guarantee of resistance to manipulation.Indeed, we demonstrate that NP-hard manipulations may be tractable in the average-case. For this purpose, we augment the existing theory of average-case complexity with new concepts; we consider elections distributed with respect to junta distributions, which concentrate on hard instances, and introduce a notion of heuristic polynomial time. We use our techniques to prove that a family of important voting protocols is susceptible to manipulation by coalitions, when the number of candidates is constant.