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Acknowledgements
We would like to thank John Ballingall, John Boyd, Melleny Black, Paul Carpinter, Jeremy Corban, Charlotte Denny, Tony Fenwick, Andrea Forde, Michele Lloyd, Michael Reddell, Jim Thomson and Peter Wilson for helpful discussions, comments and suggestions during the preparation of this paper.
Disclaimer
This document was commissioned by the New Zealand Treasury. However, the views, opinions, findings and conclusions or recommendations expressed in it are strictly those of the author(s), do not necessarily represent and should not be reported as those of the New Zealand Treasury. The New Zealand Treasury takes no responsibility for any errors, omissions in, or for the correctness of, the information contained in this Paper.