[EM] Warren: MDDA, FBC, Approval, RV

[Chris Benham]

Mike,

> Add top or Mono Add Top sounds like a Woodall re-naming of one of the 
> criteria related to Participation. I call those "adverse results 
> criteria". So far as I know, all rank methods other than Borda (and 
> maybe a few of its close relatives) fail Particiption.

Mono-add-top is on a list that Woodall refers to as  "monotonicity" 
properties/criteria, that includes Participation.

Mono-add-top just says that a candidate can never be harmed by adding 
some extra ballots that have that candidate ranked top.

Obviously it is Participation-like and is implied by Participation, but 
it is much weaker  (and is comparatively a bit arbitrary).

Examples of  methods that meet Mono-add-top but not Participation are  
IRV  and  MinMax.


Chris Benham