[EM] STV - the transferrable part is OK (fair), the sequential round elimination is not

[Raph Frank]

On Mon, Nov 2, 2009 at 11:58 PM, Juho <juho4880 at yahoo.co.uk> wrote:
> Droop guarantees the first seat already with somewhat less than votes/seats
> number of votes but d'Hondt does not => ??

Sorry meant a 4 seater.

In a four seater, a party with 20%+ of the vote is guaranteed a seat
no matter how the other votes go, d'Hondt and Droop.

A party with 79% of the vote and 3 seats will have a divider of 4 and
will thus be unable to take the last seat, as the 20%+ party will have
a divider of 1 and 79/4 is less than 20.

Also, in d'Hondt splitting a party into 2 sub-parties can never result
in an increase in the number of seats. Thus, no matter how that 79% is
split between other parties, the 20%+ party is guaranteed to at least
retain its seat.