A Weaker SSFC:
If, instead of saying that if the majority preferring the CW to Y vote sincerely, then Y should lose, we could say that that majority has a sincere way of voting that ensures that Y will lose. That makes the criterion easy to meet.
In fact, if we make it that easy, we don't even need the part about the CW:
Sincere Strategy Criterion (SSC):
If a majority prefer X to Y, then they should have a sincere way of voting that will make Y lose.
[end of SSC definition]
SSC is met by Approval. AERLO or ATLO confer SSC compliance on a number of methods, including Condorcet wv & Bucklin.
Un-enhanced Condorcet wv doesn't meet SSC. Because Approval beats Condorcet wv, by SSC, because Approval doesn't allow voting of all of one's preferences, SSC is misleading and unfair, and I probably won't use it.
A stronger SDSC:
Expressive Strategy Criterion (ESC):
If a majorilty prefer X to Y, then they should be able to make Y lose, while voting all of their preferences.
[end of ESC definition]
I call it expressive voting if somone votes all of their preferences. It would be unfair to say that a ballot isn't sincere if it doesn't do that, since Approval doesn't allow it. Hence the term "expressive".
I call a ballot expressive if it votes all of the voter's preferences among the candidates.
AERLO confers ESC compliance on Condorcet wv & Bucklin. ATLO confers ESC compliance on Condorcet wv.
I probably will sometimes mention ESC, because being able to vote all of one's preference while meeting the goal of making some Y lose, can have practical value. AERLO & ATLO, though they add something that the voter can do, in addition to ranking candidates over eachother, don't diminish the effect of voting candidates over eachother and thereby affecting the outcome.
Mike Ossipoff
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