[EM] Arrow's Theorem.

Markus Schulze markus.schulze at alumni.tu-berlin.de
Tue Jul 15 00:53:02 PDT 2003

> I really want Approval to fail a condition of Arrow's
> Theorem somewhere.

Arrow's Theorem says that there is no preferential paretian
non-dictatorial single-winner method that meets IIA.

Approval Voting, Average Rating, Median Rating, etc. are no
preferential methods.

To be a preferential method, the method must be defined
on every possible set of orders of merit and must not
take more into consideration than just the orders of

Markus Schulze

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