[FireBeyond]

> This is not so far off what happens with the Greens - in the last federal election they had about a 15% first-preference vote across Australia, but ended up with only 1/150 seats in parliament.

As someone who has lived in the US and Australia... the difference would be that in the US, the Greens would get nothing, zero. And due to gerrymandering, it's equally likely that even without party C in play, you can and do easily get situations where 30% votes for party A but win a majority.

Even in our recent mid terms here, whilst the House went back to Democratic control, in the Senate the Republican vote went down 20% but they didn't just keep the same number of seats, they _increased_ their majority.