May's Theorem
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
In voting with only two options, simple majority rule is the only decision rule that simultaneously satisfies anonymity (who votes doesn't matter), neutrality (options are treated equally), and positive responsiveness (more votes means winning).
SCAFFOLDING EFFECT
Reduce cognitive load
It proves the boundary of the legitimacy of majority rule. It tells us that once there are more than two options, or if weighting is needed, majority rule is no longer perfect. This is the mathematical reason why complex democratic decision-making often gets into trouble.
Anchor fast decisions
This term is difficult to confirm in mainstream knowledge bases; it is suspected to be 'May's Theorem' (such as Kenneth May's axioms on majority rule) or a translation difference; do not fabricate.
MINIMUM ACTION
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/May%27s_theoremverified
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