"At today's house prices a small change in interest rates makes quite a difference to affordability and I think that's what's bothering the market."
LVRs have been a target for the real estate industry in the past few weeks but Stephens believes their impact has been overplayed.
"We did quite a bit of work on exactly how macro-prudential tools like these affect markets overseas. It tends to be quite a short sharp impact that lasts about six months. It just does not look like that, what we are seeing at the moment."
Stephens said he was not convinced by arguments that the solution to the housing crisis was simply to increase supply.
"I think it's a lot more complicated than that," he said. "They've risen all over New Zealand since 1990, to a massive extent, whether the population has grown or not."
Two things having a much bigger impact than population growth were the drop in average mortgage rates allowing people to borrow more and the tax system which was incentivising New Zealanders to buy land.
"We're incentivised to own land to the exclusion of other forms of saving and that has skewed the New Zealand economy."
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