[EM] serious strategy problem in Condorcet, but not in IRV?

[Dave Ketchum]

On Tue, 19 Aug 2003 16:58:36 -0400 Stephane Rouillon wrote:

 > Dave Ketchum a écrit :
 >
 >
 >><snip>
 >>      In Ranked Balloting:
 >>           I read above of "burying" - ranking a competitor at the bottom
 >>of the pack, BUT:
 >>                If the competitor is that undesirable, this is normal 
voting.
 >>                If this causes a less desirable competitor to win, this
 >>was self destructive deviousness, visiting deserved pain on those so dumb.
 >>
 >
 > This can happen with plurality too in a three runners election...
 > Expected:
 > A: 34
 > B: 33
 > C: 32
 > D:   1
 > Reality:
 > A: 33
 > B: 30
 > C: 34
 > D:   1
 >
 > Supposes I am a C>B>A fan.
 > If with a friend, we move our vote from C to B to block the expected 
election of A,
 >
 > we could end up making A win!!!
 > Expected after "strategy":
 > A: 34
 > B: 35
 > C: 30
 > D:   1
 > Unexpected reality:
 > A: 33
 > B: 32
 > C: 32
 > D:   1
 >
 > Classify strategies as much as you want, it is not their nature that is 
important.
 > It is their probability of occurence and their consequences.
 >
 > Steph
 >
Ok:

       You wanted C to win.
       You decided that was not possible.
       So you made sure C lost.
Deserved - and says deviousness can afflict Plurality, when I thought not.
-- 
davek at clarityconnect.com  http://www.clarityconnect.com/webpages3/davek
   Dave Ketchum   108 Halstead Ave, Owego, NY  13827-1708   607-687-5026
             Do to no one what you would not want done to you.
                   If you want peace, work for justice.