For those who do not know what it is, SNTV is a electoral system that utilises multi-member districts with giving voter only one single, non-transferable vote, and given a large enough district magnitude, is capable of producing semi or near-proportional outcome that gives both small and large parties chances to be represented...
or so I thought.
The reality is, the voting under SNTV is extremely strategic due to its use of simple plurality for seat allocations, and due to the votes are being non-transferable, yes, small party may be benefitted from tactically nominating and concentrating voters support on only a few of candidates, but this is also at the expense of disproportionating other parties in the situation if voters over-concentrated their votes on only one or few number of candidates, the exceeding votes they received will simply be rendered 'wasted votes', or if voters spread their votes across too many candidates, it may cause medium-big parties to elect less or even none candidates than they entitled to proportionally.
But here I'd propose a compensatory system by mixing SNTV with a quota-based vote-allocating seat compensation mechanism to compensate the huge disproportionalities for medium-big parties that may happen in moments of failures of both nominating and voting strategies in SNTV system, and it goes like this:
By measuring the votes by Hare quota, if one of the winner (candidate of the same party) in the same district receives more votes than entitled to (exceeded the quota, or, at least getting one more vote than 2nd plural winner's vote count, just for example), its wasted votes will now become useful, surplus votes, that may be allocated to other losing candidate(s) of the same party, that otherwise failed to get elected under original SNTV, to be elected in compensatory seats,
Same works for losing candidates if there's no plural winners' among, if no one in the same party gets elected locally, their vote may be re-allocated to their best chance candidate(s) to be elected in compensatory seats,
But one must get enough re-allocated votes (from exceeded winners' and/or from all other candidates in the same party that also lost the race) to reach the Hare quota to win its seat.
Hare quota is used here for requiring the potential runner-up to reach the proportional amount of votes to justify its share of (additional) representation, just so to be fair toward other local winners.
(All this is based on the presumption of local winners' vote shares are being uneven, as non-transferable voting results tend to be, that when someone gets elected with Hare quota amount of votes(and usually getting exceeding votes as well) it does not guarantee others will meet the same quota, and most of remaining winners will likely be elected only under their largest groups of remaining votes(aka largest remainders), and so an additional, compensatory seat that fits the ideal quota of the district, and has more vote than average vote shares of local seats may considered fair.)
Pros:
Lesser vote waste
Easier vote counting
Does not have 'decoy list' problem
Party has to come together to benefit from this mechanism, this will also alter the political party fragmentation nature of SNTV, and I see this as an improvement for parties to able to hold some of its member on their party policies
Voters don't need to worry about ranking how many candidates like under STV
Cons:
Voters have lesser choice than under STV (as it is not rank-choice voting)
Votes are only 'allocatable' for the candidates from the same party, so Independent or other parties candidates cannot benefit from 'vote transferring' unlike STV
The size of Parliament will increase considerably due to additional compensatory seats like MMP
But since the compensation is done only within the same district so overall proportionality may still be limited
Despite the fact SNTV being rarely used around the world and largely forgotten after the advent of STV as a method of nominal-based proportional representation(semi or not), I still see the simplicity to vote/count, less-majoritarian outcomes of SNTV valuable for adoption of new-born democracies, that I think by patching things up a little may make the system work fairer towards different parties, big or small (or medium haha😄)
Thanks for reading this long jibe of ideas of mine, and please do let me know what'd you think of this proposal of electoral system
(also, I think I need to come up with a better name for this system than 'SNTV-QBC', as if SNTV itself doesn't sound like a tv channel already 🥴 ((
Ideas inspired by: historical usage of SNTV in Japan(1950s-1994) and Taiwan(1992-2004), Irish and Australian uses of STV, MMP(particularly the one vote MSV, and Zweitmandat variant), 'Sekihairitsu' mechanism in current Japanese parallel voting system, Hungarian PVT(vote linkage version of MSV), the usage of Hare Quota small district-ed PR in Hong Kong(which in practise turns into a form of SNTV, used in 1998-2019)