I think a lot of this comes down to the neoliberal reforms of Rogernomics. Neoliberal capitalism is a failed experiment at this point, that trends towards wealth disparity and concentration of wealth with the elite. We were sold on the dream of a free market helping everyone, but it has not done this.
This isn't unique to NZ, of course. Just look over at the UK and the current Tory government. Massive inflation, cost of living out of control, and a housing shortage.
Without protection for the working class against exploitation the trend will always be towards wealth hoarding. Our current system rewards greed, selfishness and shortsightedness.
How do we address this? Well, Labour was beginning to try with things like raising the minimum wage and FPAs. Nothing much will improve in the next 3 years, however.