[EM] Retraction about IRV, Brams, and Later-No-Harm
nkklrp at hotmail.com
Tue Dec 23 17:40:02 PST 2003
What Brams showed was that, contrary to the frequent claims of IRV
promoters, IRV gives strategic incentive to truncate one's ranking.
It was some time ago when I read of that, and a few minutes ago I posted,
probably mistakenly, that Brams showed that IRV fails Later-No-Harm.
Most likely, in Brams' example, someone truncated, causing a higher-ranked
truncated candidate to beat a lower-ranked truncated candidate.
But, if IRV meets Later-No-Harm, that means little. IRV protects your
favorite from your lower choices by eliminating your favorite before IRV
lets you help your lower choices. IRV saves your favorite by eliminating
him. A sort of electoral euthanasia.
If IRV's Later-No-Harm "advantage" is the kind of benefit that we get from
Later-No-Harm, then it's questionable how important that criterion is.
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