Fees only one part of default fund debate

While the current default fund system isn't up for review until 2014, the Green Party's election policy of creating a "public option" default fund managed by the Guardians of the New Zealand Superannuation fund has put the issue into the spotlight.

The Savings Working Group, which was set up by the government to look at policy around savings, mooted a similar policy but didn't make a recommendation either way.

"We had a view that it was worth looking at but we didn't have the time or resources to fully investigate that," Mersi said.

"The government's got this product where there are a lot of people coming in who don't care who the provider is.  Our perspective was that one fund, five to six times bigger might be able to be of sufficient scale to paddle in bigger pools and deliver low fees.