[EM] Does MDDA really satisfy FBC?

[Warren Smith]

MDDA fails "add top".  That is, if you add some identical honest votes ranking A top,
that can harm A (e.g. by creating a Condorcet winner [who is not A]
who then wins, whereas previously there was a Condorcet cycle and A was the winner
on approval counts).

Now this may not technically count as an FBC failure, because I daresay there
exists some way to rank A top and dishonestly order the remaining candidates,
which still leaves A the winner.   However, in practice, it may have a very similar
effect to FBC failure.

In particular, conceivably Deluxe MDDA will still lead
to 2-party domination.  (I have not looked into this difficult question.  I am just
saying, it is not obvious.)  Some of these remarks also apply to the "DMC"
deluxe voting method.

wds