The land tax on foreigners is the perfect policy for John Key: it won't work, won't upset voters, shows he's "doing something" and, just to be sure, he's floated the policy to gauge reaction and to poll.
Not upsetting voters is crucial. No one likes paying tax. But making others pay - especially "the rich" and, even better, rich foreigners - is a plus. The policy won't lose votes and will win some. Making foreigners pay for our government is smart politics.
That the policy fails is important. There are more homeowners than home buyers. The expectation is not just that house prices stay high but that they ever increase. No government will survive the bursting of the housing bubble.
I am confident the policy won't work. The Government's number one policy agency, the Productivity Commission, spent more than a year studying housing affordability and produced a 300-page report concluding against fiddling the tax system as any sort of cure.
The commission spent another year coming up with a 350-page report of policies that would work. Such is politics that policies that won't work are favoured over those that would.