Auggie wrote on May 19
th, 2019 at 11:02am:
The proposal goes like this:
We abolish electorates for good and instead members represent the entire State as one electorate (much like the Senate). At election time, the voters vote for the political party of their choice in closed-lists. For e.g.
1) ALP
2) Liberal
3) National
And so forth..
All voters need to do is mark which party they vote for.
When counting the votes, all votes are tallied on a nationwide scale. Whichever party receives and at least 40% of the nationwide vote AND receives a plurality of votes will automatically gain 90 seats (of 150) in the House of Reps, which seats will be allocated in each State respectively.
Won't work as designed. It may tend to entrench one party in power if one major party can consistently get 40% of the vote and the other does not.
A better alternative is the Parliament of New Zealand. They use mixed member proportional: members in local seats, topped up from party lists to get proportional representation. A party needs to win one local seat or get 5% of the list vote to get representation.
Every NZ government since they introduced MMP has been a coalition, often negotiated after the fact. It may seem unstable, yet it works. Coalitions are more stable if they don't propose bad legislation, so it acts to moderate laws. Extremist crap doesn't flourish.
An Australian version might abolish 40% of the local seats in each state and replace them with statewide party lists so the number of seats remains the same. The Constitution only specifies the apportionment of seats among the states but does not mandate any particular method of filling those seats.
The disadvantage of MMP or any other similar form of proportional representation is it would allow fringe parties to be elected. This is why such systems have a minimum threshold for election, such as the 5% minimum that is used in New Zealand. In practice, a 5% threshold would only come into play for states with 20 seats or more: NSW, Victoria and Queensland.