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The author would like to thank Nick King and Peter O'Connor for their input and assistance with researching this paper. For helpful comments and suggestions I would also like to thank Rienk Asscher, Paul Rodway, David Snell, and Colin Brown.
The views, opinions, findings, and conclusions or recommendations expressed in this Policy Perspectives Paper are strictly those of the author. They do not necessarily reflect the views of the New Zealand Treasury. The Treasury takes no responsibility for any errors or omissions in, or for the correctness of, the information contained in these Policy Perspectives Papers. The paper is presented not as policy, but to inform and stimulate wider debate.