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Options to Narrow New Zealand’s Saving - Investment Imbalance

Publication Details

  • Options to Narrow New?Zealand?s Saving ? Investment Imbalance (WP 14/17)
  • Published: 18 Nov 2014
  • Status: Current
  • Author: Brook, Anne-Marie
  • Pages: (2),iv,48
  • ISBN: 978-0-478-42194-1 (Online)
  • Ref. No: WP 14/17
  • Pub. type: Working Papers
  • Responsible units: Housing
  • Copyright: © Crown Copyright
  • JEL Classification: D9; E21; H55; O16

Options to Narrow New Zealand's Saving - Investment Imbalance

Published 18 November 2014

Author: Anne-Marie Brook


The Treasury has, at times, suggested giving greater consideration to reforms to narrow the Saving-Investment gap. However, there has been less discussion of specific policy options for doing this. This paper helps to fill the gap by asking what policy reforms could help to narrow the Saving-Investment gap in New Zealand. Lower per capita growth in the capital stock overall does not seem a desirable goal, given the relatively capital shallow nature of the New Zealand economy. This suggests a need for a significantly higher rate of national saving. Previous recommendations to boost national saving have often focused on higher government saving. This paper agrees that higher public saving is desirable but argues that efforts to boost private sector saving rates are at least as important. Potential policy options to boost private sector saving include tax policy changes, a range of different retirement income policy settings and policies that affect the housing market. Internationally, New Zealand stands out as being one of the only OECD countries where individuals do not have access to any significantly tax-preferred saving vehicles other than property. Tax reform thus has potential to both raise the level of saving and improve its composition. One option may be to reduce the tax rate on capital income, such as by extending the existing PIE regime, although such a reform would need to be packaged together with other tax changes to mitigate the equity and revenue impacts. Another option would be to move toward a private save-as-you-go (SAYGO) pension system, which would pair compulsory savings with means-testing of New Zealand Superannuation (NZS). At the same time, there is a growing body of evidence pointing to the effectiveness of default policies that nudge individuals to save more (as KiwiSaver does). Finally, a number of policies are considered that would dampen house price inflation, which may help to boost private saving.

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Executive Summary

1 Introduction

2 New Zealand’s saving and investment rates compared with other advanced economies

3 Government Saving

4 Private Saving

5 Quantifying the possible impact of policies on National Savings

6 Conclusion


wp-14-17.pdf (702 KB) pp. (2),i-iv,1-48


The author wishes to thank participants at the Reserve Bank-Treasury Exchange Rate Forum held in Wellington on 26 March 2013 as well as John Creedy, Mario di Maio, Matt Gilbert, John Janssen, Nicola Kirkup, Steve Mack, Renee Philip, Roger Proctor and Michael Reddell for helpful comments on earlier drafts, and Kaeli Rowland for statistical assistance.


The views, opinions, findings, and conclusions or recommendations expressed in this Working Paper are strictly those of the author(s). They do not necessarily reflect the views of the New Zealand Treasury or the New Zealand Government. The New Zealand Treasury and the New Zealand Government take no responsibility for any errors or omissions in, or for the correctness of, the information contained in these working papers. The paper is presented not as policy, but with a view to inform and stimulate wider debate

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