• dan@upvote.au
    link
    fedilink
    arrow-up
    0
    ·
    3 days ago

    It’s the only voting system in existence where ranking someone higher on the ballot can cause them to lose the election.

    Interesting… Do you have an example of this?

    • chaogomu@lemmy.world
      link
      fedilink
      arrow-up
      0
      ·
      3 days ago

      https://medium.com/@Gbgrow/understanding-non-monotonicity-in-ranked-choice-voting-and-how-to-prevent-it-55ad54fdad06

      https://electionscience.org/research-hub/the-limits-of-ranked-choice-voting

      https://en.wikipedia.org/wiki/Negative_responsiveness_paradox#Specific_examples

      We’ve seen it happen in actual elections, as shown in the Wikipedia link.

      RCV is just a flawed system, which is expected for something created by a couple of guys 150+ years ago.

      • Sludgeyy@lemmy.world
        link
        fedilink
        arrow-up
        0
        ·
        edit-2
        3 days ago

        Disclaimer: I wrote this all for myself not to change your mind or argue. Helps if I write down my thoughts and I don’t see a problem sharing. Feel free to discuss if you like.

        35 voters: Alice > Carol > Bob

        35 voters: Bob > Carol > Alice

        30 voters: Carol > Alice > Bob

        Vs.

        41 voters: Alice > Carol > Bob

        29 voters: Bob > Carol > Alice

        30 voters: Carol > Alice > Bob

        Alice wins

        Vs.

        Carol wins

        Say you have:

        41 voters: Republican > Third-party > Democratic

        29 voters: Third-party > Democratic > Republican

        30 voters: Democratic > Third-party > Republican

        If those 29 voters couldn’t vote Third-party they would vote Democratic. So when the Third-party candidate is knocked out, their votes should favor their second pick. Democratic wins 59-41.

        If it was:

        41 voters: Republican > Third-party > Democratic

        29 voters: Third-party > Republican > Democratic

        30 voters: Democratic > Third-party > Republican

        Which makes more since on why the 6 votes moved to Republican because Republican was their second choice.

        Then Republicans win 70-30.

        In America you’d have 4 basic senarios

        25 voters: Republican > Third-party > Democratic

        25 voters: Third-party > Democratic > Republican

        25 voters: Third-party > Republican > Democratic

        25 voters: Democratic > Third-party > Republican

        In RCV, Third-party wins.

        Let’s say this

        30 voters: Republican > Third-party > Democratic

        25 voters: Third-party > Democratic > Republican

        20 voters: Third-party > Republican > Democratic

        25 voters: Democratic > Third-party > Republican

        Third-party still wins

        40 voters: Republican > Third-party > Democratic

        10 voters: Third-party > Democratic > Republican

        10 voters: Third-party > Republican > Democratic

        40 voters: Democratic > Third-party > Republican

        It would be a tie

        45 voters: Republican > Third-party > Democratic

        10 voters: Third-party > Democratic > Republican

        5 voters: Third-party > Republican > Democratic

        40 voters: Democratic > Third-party > Republican

        It would still be a tie

        45 voters: Republican > Third-party > Democratic

        5 voters: Third-party > Democratic > Republican

        10 voters: Third-party > Republican > Democratic

        40 voters: Democratic > Third-party > Republican

        Republicans win

        Let’s change it to this:

        35 voters: Alice > Carol > Bob

        35 voters: Bob > Alice > Carol

        30 voters: Carol > Alice > Bob

        Vs.

        41 voters: Alice > Carol > Bob

        29 voters: Bob > Alice > Carol

        30 voters: Carol > Alice > Bob

        Alice wins

        Vs.

        Alice wins

        They couldn’t make their whole point if you just switched Alice and Carol. And it makes much more sense that someone with Alice second would change it to Alice first.

        But when 29 votes still hold Alice as last, it does have some weight.

        Something just seems off about it and it’s because they cherry picked a senario that would work for their point.

        Alice > Carol > Bob

        Alice > Bob > Carol

        Bob > Alice > Carol

        Bob > Carol > Alice

        Carol > Alice > Bob

        Carol > Bob > Alice

        There are 6 ways to vote and they leave out half of them. Then they make Carol supporters favor Alice as their second choice.

        20 voters: Alice > Carol > Bob

        15 voters: Alice > Bob > Carol

        15 voters: Bob > Alice > Carol

        20 voters: Bob > Carol > Alice

        20 voters: Carol > Alice > Bob

        10 voters: Carol > Bob > Alice

        Carol eliminated, +10 Bob +20 Alice. Alice would win.

        If 5 voters from Bob > Alice > Carol were moved to Alice > Bob > Carol

        20 voters: Alice > Carol > Bob

        20 voters: Alice > Bob > Carol

        10 voters: Bob > Alice > Carol

        20 voters: Bob > Carol > Alice

        20 voters: Carol > Alice > Bob

        10 voters: Carol > Bob > Alice

        Alice would win

        What if everyone from Bob > Alice > Carol moved to vote for Alice > Bob > Carol

        20 voters: Alice > Carol > Bob

        30 voters: Alice > Bob > Carol

        0 voters: Bob > Alice > Carol

        20 voters: Bob > Carol > Alice

        20 voters: Carol > Alice > Bob

        10 voters: Carol > Bob > Alice

        It would be a tie.

        In bold are the three they selected:

        20 voters: Alice > Carol > Bob

        15 voters: Alice > Bob > Carol

        15 voters: Bob > Alice > Carol

        20 voters: Bob > Carol > Alice

        10 voters: Carol > Alice > Bob

        20 voters: Carol > Bob > Alice

        5 voters from Bob > Carol > Alice moved to Alice > Carol > Bob. Just like their example.

        26 voters: Alice > Carol > Bob

        15 voters: Alice > Bob > Carol

        15 voters: Bob > Alice > Carol

        14 voters: Bob > Carol > Alice

        10 voters: Carol > Alice > Bob

        20 voters: Carol > Bob > Alice

        Alice 41

        Bob 28

        Carol 30

        Bob is eliminated.

        15 votes goes to Alice. 14 goes to Carol.

        Alice still wins.

        But they set it up like:

        20 voters: Alice > Carol > Bob

        15 voters: Alice > Bob > Carol

        0 voters: Bob > Alice > Carol

        35 voters: Bob > Carol > Alice

        10 voters: Carol > Alice > Bob

        20 voters: Carol > Bob > Alice

        5 voters from Bob > Carol > Alice moved to Alice > Carol > Bob. Just like their example.

        26 voters: Alice > Carol > Bob

        15 voters: Alice > Bob > Carol

        0 voters: Bob > Alice > Carol

        29 voters: Bob > Carol > Alice

        10 voters: Carol > Alice > Bob

        20 voters: Carol > Bob > Alice

        Then when Bob is eliminated all 29 votes go to Carol.

        Then they say “It’s unfair that Carol wins”. When in reality those 29 people would prefer Carol over Alice.

        RCV might have some flaws but that article has some flaws.

        I haven’t looked at the others. I might later.

        Edit:Formatting

        • chaogomu@lemmy.world
          link
          fedilink
          arrow-up
          0
          ·
          3 days ago

          The first article is from someone who wants to save RCV, despite that one flaw that they’ve drilled into.

          The problem is that it’s a known attack vector, the Wikipedia article talks about how it was used intentionally by a political party in 2005 in Germany to effectively steal an additional seat in their parliament.

          My second link is a deeper dive into more of RCV’s many flaws. Because why stop at monotonicity? Seriously, the fact that increasing support can cause a candidate to lose, and not just lose but elect the worst choice, is insane.

          That fact that there are more flaws, just as game breaking, means we should all follow the example of the Marquis de Condorcet, the guy who invented RCV, abandoned it because he saw how broken it was.

          Then you have the lying liars at FairVote saying that the Condorcet criterion doesn’t matter in elections.

          The Condorcet criterion is that if you were to hold a series of one on one elections between all candidates, the winner of those should be the same winner of your election system. RCV fails this in most elections, which is why Condorcet abandoned it.

          It wasn’t until about 30 years after Condorcet’s death that an Englishman revived the voting method, but added a proportional twist. It still had all the flaws that Condorcet wrote about, but Condorcet was French, and lost the political games of the French Revolution, so he was mostly ignored.

          As a side note, the political writings of Condorcet should be required reading. The guy wrote this in 1790

          ‘The rights of men stem exclusively from the fact that they are sentient beings, capable of acquiring moral ideas and of reasoning upon them. Since women have the same qualities, they necessarily also have the same rights. Either no member of the human race has any true rights, or else they all have the same ones; and anyone who votes against the rights of another, whatever his religion, colour or sex, automatically forfeits his own.’