[EM] Is there a criterion for identical voters casting identical ballots?

[Juho]

Here is one very basic case where a group of voters has identical  
preferences but they benefit of casting three different kind of ballots.

In a Condorcet method there is an interest to create a loop to your  
opponents. In its simplest form there are four candidates. One of the  
candidates is our favourite and the others we want to beat. The  
others may or may not be from one party (this influences the  
probability of being able to generate a cycle at least if there are  
more than 4 candidates). Let's anyway assume that all the candidates  
will get about the same number of votes. Also in a zero info  
situation this may be a good voting strategy. The A supporters vote  
according to three patterns as follows.

A>B>C>D
A>C>D>B
A>D>B>C

If all candidates have same number of first place supporters (and  
other preferences are mixed) and B, C and D supporters don't try to  
create loops, A wins.

Juho Laatu


		
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