Justice Minister Kris Faafoi has ordered a review of electoral laws to consider donations, the MMP voting system, the length of Parliament term and voting age.
New Zealand already had two failed attempts at extending the term - one in 1967, the other in 1990.
New Zealand's one of only nine countries to hold an election every three years. The US and Canada have one every four, the UK every five years.
Should NZ have a four-year parliamentary term?
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