<div dir="ltr"><div><div>Chris and Mike,<br><br></div>your combined comments gave me an idea for a more practical version of semi-sincerity:<br><br></div><div>A method satisfies Semi-Sincerity Relative to MAM or SS(MAM) if and only if a semi-sincere modification of the sincere preferences leads to a strategic equilibrium ballot set from which the method elects the the sincere MAM winner.<br>
<br></div><div>This criterion recognizes the superiority of MAM under ideal conditions while allowing the method in question to comply with CD, for example.<br><br></div><div>Suppose our method is Benham, and sincere votes are<br>
</div><div><br></div><div></div><div>34 A>B<br></div><div>31 B<br></div><div>35 C<br><br></div><div>A semi-sincere ballot modification results in a Nash equilibrium for Benham that elects B, the MAM winner of the sincere ballot set (not to mention the modified set).<br>
<br></div><div class="gmail_extra"><div>34 A=B<br></div><div>31 B<br></div>35 C<br><br></div><div class="gmail_extra">Forest<br></div><div class="gmail_extra"><br><div class="gmail_quote"><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Date: Sun, 18 May 2014 14:46:30 -0400<br>
From: Michael Ossipoff <<a href="mailto:email9648742@gmail.com">email9648742@gmail.com</a>><br>
To: <a href="mailto:cbenham@adam.com.au">cbenham@adam.com.au</a>, "<a href="mailto:election-methods@electorama.com">election-methods@electorama.com</a>"<br>
<<a href="mailto:election-methods@electorama.com">election-methods@electorama.com</a>><br>
Subject: Re: [EM] New Criterion<br>
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Chris--<br>
<br>
One comment that I can make right away is that FBC is almost surely<br>
incompatible with CD + MMC. ...just as FBC is incompatible with Condorcet.<br>
So, in Green scenario or ideal majoritarian conditions, FBC would be too<br>
costly. So, if the 2nd of Forest's criteria, too, is incompatible with the<br>
criteria desirable for the Green scenario, that's favorable to a likening<br>
of that criterion to FBC. Sure, the differences are great too..<br>
<br>
Of course you have a point about the desirability of sacrificing one's<br>
favorite in order to save the winner under sincere voting.<br>
<br>
It could be argued that the thing being measured for is the _possibiity_ of<br>
easily (without reversal) preserving the sincere winner, whether or not<br>
it's always desirable, and that that's a matter of interest, just because<br>
it _could_ be desirable.<br>
<br>
Mike<br>
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