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Marcus,<br>
<br>
I understand that what is usually meant by "monotonicity" is what
Woodall calls "Mono-raise".<br>
<br>
" Mono-raise: a candidate x should not be harmed if x is raised on some
ballots without changing the orders of the other candidates."<br>
On the other hand, what you refer to here is not Mono-raise but is
instead what Woodall calls "Mono-add-top".<br>
<blockquote type="cite"><i>SD chooses candidate A. </i> <i> Act II: </i><i>
If "DE 19" is changed to "DE 10" then SD chooses </i><i> candidate D.
</i></blockquote>
"Mono-add-top: a candidate x should not be harmed if further ballots
are added that have x top (and are otherwise arbitrary)."<br>
<br>
You have just done the operation back-to-front. Woodall writes that we
can't have all three of his Plurality property, Condorcet(Net)<br>
and Mono-add-top. <br>
Mono-add-top is met by IRV, but is failed by all fashionable and
(IMHO) reasonable Condorcet methods.<br>
<br>
Chris Benham<br>
<br>
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