[EM] PG-MPO

[Forest W Simmons]

This method was introduced in the middle of another thread, but not as 
well as it deserved, so here goes again:

Ballots are range style.

Let R be the highest range value such that if all of the alternatives 
that are rated at or above level R are advanced to Equal Top, then for 
some alternative there is a positive difference between the number of 
ballots on which that alternative is rated Equal Top and the number of 
ballots on which any one alternative is rated above it.

Select the alternative with the greatest such difference.

This method satisfies the FBC, the Majority Criterion, is Monotone, is 
as Clone Free as basic Range is, and seems to be strategy free in the 
zero info case.

The PG stands for "Pretty Good," or is a reminder that when candidate X 
is rated below R (i.e. PG) it is not considered Equal Top.

Note that the existence of the required R above the lowest range level 
is assured, since if no higher R works, the one just above the lowest 
level will do.

Forest