The Greens are raising the minimum wage stakes with a call for it to be increased to $16 an hour.
A Labour Party bill which proposes lifting it from the current $13.50 to $15 an hour is going to be debated in parliament.
The Greens say that's not enough and they've crunched the numbers in the National Business Review's Rich List to back their case.
Co-leader Metiria Turei says the collective wealth of the 151 New Zealanders on the list rose by $7 billion during the last year, or 18 percent.
"The Rich List highlights the growing income inequality in New Zealand," Ms Turei said on Friday.
"While Kiwi families on low wages struggle to get by the wealthiest New Zealanders are doing very well."
Ms Turei says while the rich are getting richer, the Treasury is forecasting wage growth of only 3 percent to 4 percent in the foreseeable future.
"The Government should immediately lift the minimum wage to $16 to bring it into line with the wage growth of those on the Rich List."
Labour's bill isn't likely to get through its first reading because the Government favours gradual increases in the minimum wage, and will almost certainly oppose it.
Finance Minister Bill English wouldn't take a position on the bill on Thursday but says the minimum wage will eventually get to $15 an hour.
"On the current rate of increase under this Government, it will get there in 2015," he said.
NZN