Show HN: RankedVote – SurveyMonkey but focused on ranked-choice voting

Re:Show HN: RankedVote – SurveyMonkey but focused on ranked-... by godelski on Thursday October 06, 2022 @03:50PM (#33113155)

So what I think the parent is referring to is called the Favorite Betrayer Criteria[0]. The short is that there are two forms of the spoiler effect: strong and weak. RCV handles the weak case but does not handle the strong case. I explain part of why cardinal methods handle the strong case in this comment[1]. The truth is that we're far more concerned with the strong case than weak case because from our current position this is the more frequent type of spoiler (and arguably is more frequent in general).

[0] https://electowiki.org/wiki/Favorite_betrayal_criterion

[1] https://news.ycombinator.com/item?id=33111242

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Re:Show HN: RankedVote – SurveyMonkey but focused on ranked-... by bombcar on Thursday October 06, 2022 @04:34PM (#33113724)

I wonder if fixing the "strong case" spoiler actually is NOT what some "spoiler voters" would want, simply BECAUSE they want to spoil for the other party to try to move that party toward where they want it to be.

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Re:Show HN: RankedVote – SurveyMonkey but focused on ranked-... by godelski on Thursday October 06, 2022 @06:27PM (#33114941)

Probably. But I don't think the public really wants their voting systems to be highly vulnerable to strategic voting. That does just give elites an edge and ends up with less equitable representation.

(strategies exist for ALL voting systems. But not all strategies are equally as bad)

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Re:Show HN: RankedVote – SurveyMonkey but focused on ranked-... by dane-pgp on Friday October 07, 2022 @12:49AM (#33117568)

> not all strategies are equally as bad

That's an important point. Also, just because a strategy exists in theory, doesn't mean that in practice any voter can confidently find that strategy (since they lack perfect information about how all the other voters intend to vote).

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Re:Show HN: RankedVote – SurveyMonkey but focused on ranked-... by naniwaduni on Friday October 07, 2022 @10:58AM (#33122235)

Also, not all "strategies" fit people's intuitive notion of "strategy", which is colored by FPTP having a really glaringly awful strategic incentive for dishonest voting.

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Re:Show HN: RankedVote – SurveyMonkey but focused on ranked-... by godelski on Friday October 07, 2022 @01:41PM (#33124565)

Most cardinal systems make it difficult to vote strategically. That's actually what the difference with star and score is about. But this is also why so many in the thread are talking about monotonicity and favorite betrayer. Failing these criteria means your voting system is highly susceptible to manipulation. Essentially allowing candidates to win that shouldn't have won.

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