[EM] Real IRV Ranked Ballots

[Forest Simmons]

On Fri, 5 Mar 2004, Markus Schulze wrote:

> Hallo,
>
> Eric wrote (2 March 2004):
> > I am currently in communication with a dedicated IRV supporter
> > who may be claiming that they would move away from IRV if a
> > real example could be given where IRV selected an obviously
> > wrong winner.
>
> Actually, I believe that it is quite impossible to use examples
> to demonstrate that a given election method is lousy.

Another practically insuperable difficulty is that different election
methods elicit different insincere rankings from the voters. For example
you would probably vote differently under IRV, Ranked Pairs, and Borda,
unless the voting was done under zero information conditions, which is
unlikely in real life examples.

>
> For example, Tideman's ranked pairs method and my beatpath method
> violate mono-add-top, mono-remove-bottom, and IPDA. When one of
> these criteria is violated then it is difficult to argue why the
> used method doesn't find "an obviously wrong winner". The only
> way to justify such an example is to argue that in the long run
> the used method performs better than other methods and that the
> used method has to select this candidate in this example because
> otherwise monotonicity, independence of clones or some other
> important criterion is violated.
>
> Markus Schulze
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