[EM] VSB fails the Majority Criterion
Forest Simmons
fsimmons at pcc.edu
Fri Feb 6 13:53:09 PST 2004
Consider the following example:
51 ABC
25 BCA
24 CBA
Voter Space Borda gives A voters a score of
51*49-49*51=0,
while B voters get a score of
25*75+(24-51)*(51-24) = 1199
which is greater than zero.
If the A voters had truncated or voted CB as often as BC this wouldn't
have happened.
This can be viewed as a clone problem, too, so apparently VSB doesn't
completely neutralize clone sensitivity.
However, it is true that Voter Space Above Median Approval (VSAMA) does
satisfy the Majority Criterion, and also strongly (if not completely)
discourages betrayal of favorite.
If I had to have a pure ranked ballot method named after me, I would
probably choose VSAMA.
But, fortunately my name is not VSAMA :-)
Forest
More information about the Election-Methods
mailing list