[EM] Are rank methods really better than Approval & CR?
nkklrp at hotmail.com
Tue Jun 14 22:49:45 PDT 2005
Judging from what I was saying the other day about strategy for MMPO & wv,
maybe it's time to question the value of rank-balloting, when optimal
strategy can, and always will in acceptable/unacceptable situations, involve
equal ranking (with MMPO) or favorite-burial (with wv).
Some criteria (both yours and mine) need another look. I always justified
the majority defensive strategy criteria by saying that a majority should be
able to protect majority wishes without drastic strategy. If someone voted
so as to make use of compliance with those strategy, but didn't have the
necessary majority support, and it backfired, one could say that's ok,
because it's a _majority_ that we want to protect the rights of. That's all
very well, but the voter cares about his outcome even if we disregard him
because he isn't in the majoritity described by those criteria.
Someone could say that CC, Smith, ICC & MMC would be helpful to a voter who
knew that everyone else would vote sincerely, and that the CW was someone ok
Someone could say that the majority defensive strategy criteria will help a
voter once previous elections, or good polls, or better media, have given
hilm information that he's in one of those majorities described in the
But wait--isn't that the kind of information that would enable confident and
successful Approval voting? Aren't the rank methods supposed to get rid of
Approval's need for information? Do they?
Maybe we should instead be more concerned about what it takes for an
individual voter to optimize his/her outcome when s/he doesn't have that
kind of information.
Someone who looked at the ranking strategies that I posted yesterday, could
ask the embarrassing question "How is MMPO really better than Approval?"
Or the even more embarrassing question "How is wv better than IRV?"
Well then, is there any way that a rank method is really better than
Approval, as regards what it takes for an individual voter to optimize
his/her outcome when s/he doesn't have majority information, or a guarantee
that everyone will vote sincerely?
Yes: Strong FBC and SOACC. Those are what rank methods can offer that
Approval doesn't offer.
Further, a method that meets SOACC and SFC and SDSC then gives to the voter
the genuine full benefit of SFC and SDSC. SOACC lets the voter vote in the
ways stipulated by SFC, without fear of sub-optimal outcome. SOACC gives
similar protrection for SDSC.
So the real benefit of rank balloting is with methods that meet Strong FBC,
SOACC, SFC, and SDSC.
MMPO with AERLO, for instance.
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