[EM] Automatic LIIA Independent of Locking Order

[Kevin Venzke]

Hi Kristofer,

Le vendredi 1 mai 2026 à 16:04:03 UTC−5, Kristofer Munsterhjelm <km-elmet at munsterhjelm.no> a écrit :
> For new combinations of criteria, I think it would be useful to look at
> three-candidate elections first and see if any patterns stand out.
> That's how I figured out the whole resistant set concept, at least. But
> even that's hard: does there exist a three-candidate method that passes
> all of MMPO's criteria without its extreme Plurality failures? Who knows.

It would be interesting to have any additional method at all that satisfies weak FBC
slash AFB and Later-no-harm. I think MMPO is the only known one. Or maybe one of the
Borda interpretations does this too.

I did come up with a "Plurality-corrected MMPO" around a year ago, that I should
post something about. It uses the same technique as Adjusted Condorcet Plurality as
I recall. It satisfies Later-no-harm and Plurality, but has curiously awful
monotonicity. It surely doesn't satisfy FBC (I never really tested that but I can't
imagine how it would be possible, as we must identify a key "first preference
winner"). I think by some metric or other it was slightly better than ACP, but that
is not saying much.

Kevin
votingmethods.net