Rising house prices and falling home loan affordability creates stress and anxiety for some people, including those who think about the public policy settings we should have around these pressures.
The fastest headline can be gained by those who advocate restricting migration as a 'solution' to these pressures. If supply issues can't or won't be addressed, lowering demand pressure by getting rid of some buyers who compete in the market seems like an 'obvious' answer.
Those who advocate such an approach invariably need to dance around nationality issues when they frame their proposals.
The nationality of inbound migrants appears to be less of an issue when they are coming from 'traditional' European countries, more of an issue when they come from emerging economies.
Migrants from the UK peaked at almost 23,000 per year in 2006 when the last housing bubble was in full swing.
Migrants from Australia peaked at almost 19,000 back in early 1991.
Migrants from China peaked at more than 17,000 in 2003, and are currently running at about half that level.
Migrants from India peaked at about 7,500 per year in late 2010 and have fallen back by more than 1,000 per year.
We currently absorb almost 90,000 migrants per year (87,800 in the year to May 2013).
Inbound migrant flows peaked in February 2003 at 98,700.
The peak of New Zealanders emigrating was much more recent - 88,000 left in the year to February 2012.
The latest data of net long-term migration is for May 2013 and in the year till then, we had a net inflow of 6,200 people which was way below the 43,000 it peaked at in 2003.
Apart from in 2003, immigrant pressure has been a minor factor in housing price rises on an overall basis. No doubt in specific cases you can find spirited bidding by migrants, but overall pressure from new migrants has to be modest given that none of the incoming stats are at record levels. If there is pressure from this quarter, it is because more Kiwis are choosing to stay as emigration levels are down more than 7% in the past year.

The net permanent migration flows look quite different.

There has been a correlation between migration and house price rises. However we are now starting to see faster rises than can be attributed to migration. Constrained supply has kicked off increasingly fierce competition for the existing housing stock; migrant demand is still there but not the underlying cause of the recent sharp run-up in prices.

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