Talk:IRV Prime: Difference between revisions

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::In that case, if C is the winner and IRV Prime is majority rule in the two-candidate case, eliminating A (an irrelevant candidate) will make B win, which is a violation of IIA. [[User:Kristomun|Kristomun]] ([[User talk:Kristomun|talk]]) 09:17, 4 August 2021 (UTC)

You're correct, thanks for that example. It does not fulfill IIA: (sorry I'm still learning this stuff)

if one candidate (X) would win an election, and if a new candidate (Y) were added to the ballot, then either X or Y would win the election.

But if you look at the ballots, this actually makes sense from a social representation perspective:

{{ballots|

35: B>C

30: B>C

25: C>B}}

B best represents the population.

However, when A enters the race, B no longer has the votes to win, so their voters must now compromise. By definition it's still a "spoiler candidate", but it's the opposite effect: in plurality, a spoiler results in a candidate that could win to lose (by vote splitting); in IRV-Prime, it causes votes for a candidate that was going to lose to shift to those voters' next favorite.

--[[User:Marcosb|Marcosb]] ([[User talk:Marcosb|talk]]) 16:18, 4 August 2021 (UTC)

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