If the parties that lost the last election can demand that the Government seek an additional electoral mandate to implement the policies National stood on in its 2011 manifesto, then surely the same applies in reverse.
Every time the state buys something with taxpayers' money, it should ask permission.
Labour should have held a referendum on buying buy Air New Zealand, buying the Auckland railway network then buying the national rail network then buying TranzRail.
If the state should gain permission when it sells assets, it should also seek it when it buys them.
Somehow, I doubt the idea will gain traction with Labour and the Greens, because to them when they spend taxpayers money, acquire property for the state - it is "good" for it is for "everyone".
In other words, the state can always accumulate more and more property with your money, but it daren't dispose of any of it. However, none of that is really a surprise is it?