[EM] Sincere Protection of Candidates Acceptable (SPCA)

[MIKE OSSIPOFF]

If we can't always get optimality while sincerely ranking the acceptable 
candidates, at least we can offer what really matters: maximize the 
probability that an acceptable will win.

Sincere Protection of Candidates who are Acceptable (SPCA):

If, for a particular voter, the election is an acceptable/unacceptable 
situation, then that voter should be able to maximize the probability that 
the winner will be an acceptable candidate, while voting all of his/her 
preferences among the acceptable candidates..

[end of SPCA definition]

Strong Sincere Protection of Candidates who are Acceptable (SSPCA):

If, for a particular voter, the election is an acceptable/unacceptable 
situation, then that voter should be able to maximize the probability that 
the winner will be an acceptable candidate, while voting all of his/her 
preferences among the acceptable candidates, and without falsifying any 
preferences.

[end of SSPCA definition]

MMPO with AERLO meets SPCA.

In an immediately subsequent posting I'll describe an enhancement that 
attains SSPCA for MMPO.

Possible alternative wording: Instead of "maximize the probability that the 
winnner will be an acceptable candidate", one could instead say: "cause the 
winner to be an acceptable candidate in any configuration of other people's 
votes for which that voter's ballot can do that. Then, the criterion should 
probably speak of a set of voters instead of one voter, even if that might 
not be essential.

So far I'm leaving the criterion as first written in this posting.

Mike Ossipoff

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