[EM] IRV & Spoiler Effect

[Curt Siffert]

I've slotted it in my mind by saying that Condorcet is spoiler-free 
(Full IIAC
satisfying) right up through the identification of the Schwartz set.  
Is that right?

Curt

On May 12, 2004, at 10:33 AM, wclark at xoom.org wrote:

> Eric Gorr wrote:
>
>> If this is true, no ranked ballot method can be free from the spoiler
>> effect, but do we not generally claim that the better Condorcet
>> methods are spoiler free?
>
> Condorcet is sometimes claimed to be spoiler free because it can 
> satisfy
> what RobLa called "relaxed versions of IIAC, such as Local IIAC."
>
> Full IIAC (which does indeed capture the spirit of the spoiler effect) 
> is
> argued to give Condorcet trouble only when there is an actual 
> ambiguity in
> the will of the electorate, e.g. cycles.  In all other circumstances
> (characterized by "Local IIAC" or its variants) Condorcet actually 
> passes.
>
> Whether or not you concider cycles in Condorcet to be an artifact of 
> the
> system, or a representation of actual ambiguity, obviously plays a big
> role here.
>
> -wclark
>
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