Unfortunately the currently in power government has done a lot to court this outcome, and so has mostly been avoiding doing anything about it. I think they did recently step in to make it harder for Chinese investors to purchase property in NZ though.
This is due to not only global wealth, but also locals that have been trained to believe that housing is the only good retirement investment.
Canada has finally taken some measures to reign this in, with the 15% foreign investor tax in BC and tougher mortgage rules, but a lot more needs to be done. NZ has finally started adding more regulation around housing investment as well, but I feel like they're still far behind where Canada is at.
By US state, Hawaii's average sales price is $740k (listing = $980k). DC's average listing price is $703k (sales = $538k).[0] If sales price, Auckland seems to be about $100k USD over Santa Cruz County, CA.