handoflixue comments on No independence of irrelevant alternatives (picture proof) - Less Wrong

7 Post author: Stuart_Armstrong 03 May 2012 05:48PM

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Comment author: handoflixue 03 May 2012 07:47:24PM 2 points [-]

How does having a "disagreement point" prevent this same scaling trick? It seems that the issue is more-so with the ability to arbitrarily rescale using a different scaling function for each axis...

Comment author: Stuart_Armstrong 03 May 2012 09:04:38PM *  2 points [-]

The disagreement point gives origins to both utilities, and prevents translations. It turns out that IIA can apply if only scalings are allowed, even different scalings (see Nash bargaining in my other post)