David Farrar falsely equivocates when he asks the following:
Why do so many people who complain that ACT got five seats in Parliament on only 3.65% of the vote, never complain that the Maori Party got five seats in Parliament on 2.39% of the vote?
The issue isn’t so much that ACT didn’t deserve seats for their share as that, for proportional consistency’s sake, NZ First deserved seats for their share as well. From there, people work backward to ‘If NZF didn’t get them, why should ACT have gotten them?’
The overhang is a misdirection away from the fact that the 5% threshold is the main source of entropy in our proportional system (and its neighbour SM). The two types of electedness he suggests are the same — winning an electorate and coming in on the list — aren’t, as David well knows, and this is a capricious argument from him. To prevent an electorate member from sitting on proportional grounds directly disenfranchises the electorate who voted for her. The solution to a system which arbitrarily disenfranchises a large number of voters on the basis of other voters’ decisions surely isn’t more disenfranchisement — it’s less.
As I’ve argued before, removing or lowering the threshold would reduce voter regret among the supporters of marginal parties, and embolden those electors to vote for their chosen party, resulting in truer representation. The possible impact on an overhang party — one which has traditionally won more seats than its share of the vote would otherwise entitle it — is an interesting case, and would force people who now vote tactically to re-evaluate their decisions.
I have an upcoming post asking what factors people value in an electoral system, and issues like these are germane to the forthcoming discussion about MMP.