If you earn $70,000 a year in wages, you pay tax on every dollar you earn.
If you earn $70,000 because the value of your investment increases by that amount then, unless you are a trader, you don't pay any tax at all.
This is a subsidy for the top 10 per cent of New Zealanders who own 50 per cent of the wealth.
There's nothing wrong with people making a few dollars and doing well, but a dollar earned one way should be taxed the same as a dollar earned another way.
There is no rational reason we tax wages and the stuff we buy in shops but not the wealth that comes from owning assets that grow in value.