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Worst-case Strategy-proofness

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  • Kazumasa Ikeda

Abstract

We introduce a new non-manipulability axiom called worst-case strategy-proofness (WCSP). This axiom is weaker than strategy-proofness and stronger than non-obvious manipulability-worst (NOM-worst) by Troyan and Morrill (2020). WCSP focuses on non-manipulability in a worst-case scenario. We examine the implications of WCSP in a voting model. Although many voting rules, such as the plurality rule, the Borda rule, and the Dowdall rule, satisfy NOM-worst, they violate WCSP. We obtain a necessary and sufficient condition for the anti-plurality rule with fixed-order tie-breaking to satisfy WCSP in terms of the numbers of agents and alternatives.

Suggested Citation

  • Kazumasa Ikeda, 2026. "Worst-case Strategy-proofness," Papers 2606.22021, arXiv.org.
    • Handle: RePEc:arx:papers:2606.22021
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    File URL: https://arxiv.org/pdf/2606.22021
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