Australia's minimum wage is A$15.96 ($20.31) an hour. However, for a 40-hour week this is actually a slightly lower proportion (47 per cent) of Australia's average wage than New Zealand's minimum wage is of our average wage - 53 per cent.
Major Roberts was speaking yesterday at a national summit on inequality at Mangere's Nga Whare Waatea Marae organised by the Council of Christian Social Services and Closing the Gap, a network co-founded by actress Robyn Malcolm's father, retired Tauranga principal Peter Malcolm.
Mr Malcolm said the meeting aimed to build a national coalition of groups around the idea promoted by the British book, The Spirit Level, that everybody - the rich as well as the poor - had better health and wellbeing in more equal societies.
Major Roberts made the same point, arguing that crime was not caused by poverty but by gross wealth alongside poverty. He quoted the Catholic saint Mother Teresa, who said the worst poverty was not hunger and homelessness but "the poverty of being unwanted, unloved and uncared for".
"The poverty that we are looking at when we see unnecessary deprivation in New Zealand is basically a poverty of compassion. We don't care enough," he said.
He said New Zealand was now one of the most unequal developed countries, with a disturbing ethnic divide. Pacific children were 50 times as likely as Europeans, and Maori children 23 times as likely, to get rheumatic fever because of cold, damp and overcrowded houses. A quarter of all male Maori spent time in the Corrections system.
He said a big rise in the minimum wage between 2000 and 2008 did not cause higher unemployment, and raising the minimum further would be an effective way to lift the incomes of large numbers of workers.
He said New Zealand should also abolish tax on the first $5000 or $10,000 of income, following Australia which tripled the tax-free threshold in this year's Budget from A$6000 ($7640) to A$18,200 ($23,200).
Tax breaks for the poor had to be funded by higher taxes on middle and higher earners. "That has to be based on the expectation that the well-paid and wealthy will pay more tax."
He also called for a major house building programme and a universal child benefit.
How we compare
New Zealand
Minimum wage - $13.50 an hour
Tax on first - $14,000 10.5 per cent
Top tax rate on rich - 33 per cent
Australia
Minimum wage - A$15.96 an hour
Tax on first A$18,200 - Nil
Top tax rate on rich - 45 per cent