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Economics > Theoretical Economics

arXiv:2606.22021 (econ)
[Submitted on 20 Jun 2026]

Title:Worst-case Strategy-proofness

Authors:Kazumasa Ikeda
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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.
Comments: 31 pages
Subjects: Theoretical Economics (econ.TH)
Cite as: arXiv:2606.22021 [econ.TH]
  (or arXiv:2606.22021v1 [econ.TH] for this version)
  https://doi.org/10.48550/arXiv.2606.22021

Submission history

From: Kazumasa Ikeda [view email]
[v1] Sat, 20 Jun 2026 12:50:06 UTC (269 KB)
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