Talk:Participation criterion

Mono-add-plump

User:BetterVotingAdvocacy, the restricted version of Participation that you claim IRV and Condorcet fail, "A can't be harmed by adding a vote that bullet-votes for A", is called mono-add-plump. Here's a link that shows that at least one Condorcet method passes it: [1]. I think the Minmax-y ones also do (Schulze, RP, etc). IRV passes mono-add-top, which is a stronger (more general) version of mono-add-plump, and thus also passes mono-add-plump. I don't know about STAR, but you should probably find a source given that the other two claims were wrong. I've removed the section for now. Kristomun (talk) 11:12, 13 May 2020 (UTC)

Thanks for catching this. Edit: Actually, I didn't say "A can't be hurt by adding bullet votes for A", I said the voter can't be hurt by bullet voting. So consider that in IRV and STAR, adding a bullet vote could help a voter's favorite eliminate their lesser evil, and then their favorite loses later rounds. For Condorcet, while I am not admittedly not being rigorous there, I'm sure that adding bullet votes for Favorite could similarly start a Condorcet cycle that helps elect a Greater evil. BetterVotingAdvocacy (talk) 18:37, 13 May 2020 (UTC)

Then that criterion is not a variant of Participation. Participation says "if you show up and cast a ballot that ranks X over Y, then that shouldn't change the winner from X to Y". A bullet vote for X ranks X above everybody else, so there's only a Participation violation if the outcome changes from X to someone who isn't X. Kristomun (talk) 13:38, 14 May 2020 (UTC)