On 14/06/2019 6:18 am, steve bosworth wrote:
C: You asked me a simple yes-no question and I answered it. If you are not sincerely very stupid, please stop pretending to be.
C: That is entirely their business.
C: To "punish" a subset of voters in this context means to give them cause to regret the way they voted. How do you justify not attempting to minimise
the proportion of voters in that category, while pretending to be in favour of minimising "opportunities for tactical voting" (as I think you put it).
To the extent that you give voters incentive to vote insincerely you tend to have a "garbage in, garbage out" problem.
S: Please study Balinski's reasons for concluding ...
C: No thanks, I'm not interested in joining your Bible-study group.
S: Also, I think you can already see that IBIFA's promise to give Top-rating more weight than Middle-ratings creates an incentive to give their first preference candidate a Top-rating..
C: Shock! Horror! MJ and also all sane methods that use ratings ballots (except those that use them only to infer ranking and perhaps also approval)
have the same incentive. Generally speaking the incentive the to give a one's favourite a top-rating (or to rank no lower than equal-first) is not regarded as a
problem in single-winner methods that we should be concerned about. (Why on earth do you think it does? Obviously there can only be "no incentive"
if it can't make a difference whether they do or not.)
Rather what is of greater concern is the incentive in most methods for the voter to *not* do that. Fortunately neither IBIFA or MJ (or Relevant Ratings or Approval)
have that problem.
S: Also, IBIFA gives more of an incentive dishonestly to Bottom all of their less preferred candidates.
C: No it doesn't, as illustrated by the example in my last post.
IBIFA elects A (the CW: A>B 45-30, A>C 45-25).
IBIFA (like all Condorcet methods and IRV) elects A whether or not the A supporters "dishonestly Bottom all their less preferred candidates"
but MJ (and all other versions of Median Ratings, such as Bucklin) only elects A if they do just that.
I look forward to seeing your counter-example.
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