First, imagine that labour productivity doubled and that wages doubled. Some cost-of-living elements would ease substantially - food and tradeable goods in particular would become much cheaper relative to income. But what would happen to the cost of housing in Auckland or Christchurch? If housing supply is inelastic, then its price goes up with demand. Double incomes, and some of it will turn into improved housing quality via home improvements. But much of it will just bid up the cost of housing. How much of the wage increase would be eaten up in housing cost increases would depend on the income and price elasticities of housing demand and the price elasticity of housing supply - in other words, I don't know. But I don't think it's nuts to think you could eat up a reasonable part of any income increase with housing price increases given tight supply conditions.
"I don't think it's a crisis and I don't think it's something we can do a lot about," he said.If we have a low productivity problem, raising the minimum wage is not a particularly good idea. The minimum wage
"The main problem is on the income side and how much money we've got to spend."
He said the key to making things more affordable is to raise incomes and, in particular, to raise the minimum wage.
Hazledine says New Zealand is not a particularly productive country in economic terms.
"We don't have such high wages as Australians in particular do. This is why many New Zealanders move over there."
Incomes in New Zealand have kept in pace with inflation but have not got ahead of it.
Hazledine believes this is part of the issue. "We haven't really grown over the last 20 years and that's the problem."
I agree with Tim that the price of lots of things here seems very high. But I'm not sure that lack of competition is the most plausible answer. I can have books delivered to me from Book Depository in the UK for about 60% of the going NZ price; it's far more plausible that thin market problems and fixed costs in New Zealand are what inflate NZ book prices rather than lack of competition in the market for books.
But lack of competition is a more plausible explanation in other cases. RMA complaints kept IKEA from opening in Auckland and Wellington; furniture here consequently remains rather expensive and nobody will sell me horse-meat meatballs in lingenberry sauce. Westfield v North Shore City Council also showed how the RMA could be used to block competitors' entry.
On the whole, New Zealand runs a pretty decent set of policies for encouraging real competition: very low tariff rates while allowing parallel importation.
Both wages and real household income are up substantially on 1998.* The blue line below tracks median hourly real wages in 2012 dollars; they're up 14.6% from 1998 to 2012.** Hourly wages have continued upwards fairly nicely. Median real household income, the red line, is up 24.9% over the entire period but dropped with the recession and hasn't really come back.*** I'd expect that digging further into the tables would show some of that being due to labour force exit.
I worry that if the agglomeration folks are right, distance and scale will keep hurting New Zealand's relative position. Hiking the minimum wage really isn't much of a solution to this kind of problem. Instead we need to fix land use policy so we can increase population without killing housing costs and keep working to make New Zealand an attractive place for international migrants.
* Alas, NZDotStat only has Income Survey data back to 1998.
** Recall that the GST increased from 12.5% to 15% while income tax rates dropped to offset the increase in the GST. If you're using before-tax incomes, you have to use a GST-adjusted CPI.
*** Note that I've just used Google's default scaling for the graphs; using a zero bottom end would artificially suppress variance.