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FPTP is a ranked choice system.
by lupire 2y ago
FPTP is a ranked choice system.
- cubefox 2y agoNo it isn't.
- xigoi 2y agohttps://en.m.wikipedia.org/wiki/Ranked_voting https://en.m.wikipedia.org/wiki/Ranked_voting > The most commonly-used example of a ranked-choice system is the familiar plurality voting rule, which gives one "point" (vote) to the candidate ranked first, and zero points to all others (making additional marks unnecessary).
- cubefox 2y agoThis is not what is usually meant with the term (plurality voting is different from ranked voting where there are non-trivial preference orderings) and in any case not what the Arrow theorem applies to.
- xigoi 2y agoArrow’s theorem defines a ranked voting system as a function that takes a permutation of the candidates for each voter and outputs a single permutation of the candidates. As a special case, if you take the function which sorts the candidates by how many voters ranked them as first, you get plurality voting.
- cubefox 2y agoAnd that makes plurality voting different from ranked voting where the voters can submit arbitrary preference orderings. In any case, as I said, the Arrow theorem doesn't apply to plurality voting, as there can be no cycles in the aggregate.