[EM] [CES #8922] Score Voting and Approval Voting not practically substantially different from Plurality?

Benjamin Grant panjakrejn at gmail.com
Mon Jun 24 08:20:54 PDT 2013

On Mon, Jun 24, 2013 at 11:08 AM, Stephen Unger <unger at cs.columbia.edu>wrote:

> Regarding the plurality criterion:
>  The Plurality Criterion is: "If there are two candidates X and Y so
>  that X has more first place votes than Y has any place votes, then Y
>  shouldn't win".
> It is NOT worthy of  respect.
>  Consider the following 2-candidate SV election.
> #votes  C1  C2
> 51       9   8
> 49       0   9
> C1 should win according to the Plurality Criterion, but obviously C2
> is the people's choice. One of the advantages of SV is that it
> properly handles cases like this.
> Steve

OK, SV=Score Voting, right?  Score voting doesn't have places, does it, as
it is not a ranked based system? I agree with you that in the above
election C2 should win, of course - although some would not.

I dunno, maybe I don't under this, or maybe the Plurality is better defined
without referring to first place or any place.

I guess that's my next question: is the Plurality relevant to non ranked
systems? Is the Criterion used by experts (like you guys) to refer to C2
winning about as failing the Plurality Criterion? Or is it only about
things like Bucklin and IRV?


-Benn Grant
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