[EM] When Voters Strategize, Approval Voting Elects Condorcet Winners but Condorcet Methods can Elect Condorcet Losers

Juho juho4880 at yahoo.co.uk
Tue Jul 17 12:22:48 PDT 2007

- Some Condorcet methods (e.g. Minmax(margins)) elect Condorcet  
Losers with sincere votes. In some extreme situations the Condorcet  
Loser may be the best candidate.

- Note also that the Condorcet specific problems do not do not  
materialize in most elections. I haven't yet seen any good examples  
where some large scale public elections where voters make independent  
decisions on how to vote would tend to fail.


On Jul 16, 2007, at 7:32 , ws at cs.brown.edu wrote:

> I've written a short paper that I think you may find interesting.  
> It's still
> somewhat drafty, but it's good enough to share.
> Here's the abstract:
> We show that approval voting strategic equilibria are closely  
> related to honest
> Condorcet Winners. There exists an approval equilibrium with a clear
> font-runner F and runner-up R if and only if the F is the clear  
> Condorcet
> Winner and R the Condorcet runner-up. In contrast, we show that  
> Condorcet
> methods can elect a Condorcet Loser with non-zero probability when  
> voters vote
> tactically. With strategic agents, approval voting is better at  
> electing
> Condorcet Winners than Condorcet methods!
> Paper is available at http://www.cs.brown.edu/~ws/approval.pdf .  
> Please
> send comments and/or questions my way.
> thanks,
> ws
> ----------------------------------------------------------------
> This message was sent using IMP, the Internet Messaging Program.
> ----
> election-methods mailing list - see http://electorama.com/em for  
> list info

The all-new Yahoo! Mail goes wherever you go - free your email address from your Internet provider. http://uk.docs.yahoo.com/nowyoucan.html

More information about the Election-Methods mailing list