RCV vs MLV redux

Every time I think I’ve shown that ranked-choice voting is a step forward but no panacea, it appears again. Latest reply to a NakedCapitalism post below:


Ranked choice voting *sigh*. Don’t get me wrong: in choice between RCV vs FPTP (the status quo in most of USA and UK) and I go for RCV in a heartbeat, particularly since I have dual UK-Australian citizenship. However, there are people playing with fire here using arguments they don’t understand and if you’re interested in anecdotal evidence, those of us who spent decades eliciting public preferences in Australia came to despise the Conversation for its terrible editing etc which allows statements like, in the current article:


“Some critics incorrectly claim that ranked choice voting lets voters cast more than one ballot per person, when in fact each voter gets just one vote.”


 True but highly misleading and proponents will be in REAL trouble when the FPTP PMC class find the right “sound-bite” to counter this. Here’s one possibility: “RCV lets voters cast one vote but some votes are worth are a lot more than others”. My colleague Tony Marley couldn’t prove this was wrong in his PhD back in the 1960s and freaked. He ended up making a much milder statement. RCV (based on the rank ordered logit model) does NOT give everyone equal weight in the (log)likelihood function and this can matter hugely.


 South-West Norfolk is a UK Westminster Parliamentary constituency in which RCV would make ABSOLUTELY NO DIFFERENCE because the Conservatives practically always win it with way more than 50% of the primary vote – there would BE NO “second round” etc. The fact that at the last election a candidate for the Monster Raving Looney Party stood – something that only ever used to happen in the constituency of the sitting Prime Minister as a publicity stunt – shows that anger in the general population is spreading.


 Statements above in this thread have been that RCV can lead to “communism” or “mediocrities”. True but not the experience in Australia. In fact it simply allowed “non-mainstream” people on both sides to gain a few seats but the broad split in terms of “left and right” was replicated in Parliament. Sounds good? Hmm. Statement of (non) conflict of interest. I am one of 3 world experts in a way of eliciting public preferences called Best-Worst Scaling. Dutch/Belgian groups applied it (with NO input/knowledge from me) to voting to give “Most-Least Voting”. A “scaled back” version of RCV in which you ONLY indicate “top” and “bottom” candidate/party. This is because people are lousy at “middle rankings”. I once hypothesised a scenario as to where RCV could give a seriously problematic result which MLV might avoid. To be honest I considered it a theoretical curiosity. Until it happened in the Iowa 2016 Democrat Primary. Essentially there was a dead heat (approx 49.75% each) for Sanders and Hillary. O’Malley came a distant third with 0.5%.


 RCV would have essentially given 0.5% of voters in a single state the decision as to who won and got the crucial “momentum” that might have made them unstoppable. MLV would probably have gone as follows: Sanders supporters put him as most desired and Hillary as least (49.75-49.75=0% net score). Vice versa for Hillary. O’Malley gets 0.5%; which of Sanders/Hillary is “last” depends on whatever O’Malley’s supporters think is the “worst evil”. I don’t know who they’d have chosen. But it doesn’t matter. He’d have won.


 Many will say “for the last placed first-voted individual to win is a travesty”. I’d reply “why is this any less of a travesty than 0.5% of Iowa Democrats potentially deciding who faces Trump?” Depends how you phrase it. Arrow’s Impossibility Theorem all over again. Effectively Iowa was a tie in which neither Sanders nor Hillary “deserved” a win. It should have caused the “race” to move on. Instead O’Malley dropped out. You see how the SAME votes can lead to VERY different results depending on the system (likelihood function)? After all, MLV with 3 candidates *IS* RCV! At least in the “ranking” you give. But the AGGREGATION and WEIGHTING is different.


 Final note – for those who think I’m plugging something “I devised” – you haven’t read the post. I WISH I’d been involved with voting theory. But it’s one area I had NOTHING to do with using BWS. I admire the Dutch and Belgians for applying it this way and it has, in fact, been used in Baltic States. So it ain’t some weird theoretical curiosity. Ironically it MIGHT lead to some centrist “mediocrities”. But given Hillary and Trump, maybe that might not have been so bad?


 RCV is a step forward. But be careful what you wish for. Personally I think that redistricting to eliminate uncompetitive seats (gerrymandering) and other aspects of electoral reform are at least as important as changing the voting system. I’ve given the references before on here and elsewhere. Happy to engage in constructive discussion since NO voting system is fair.