Superannuation as a percentage of GDP will stay the same even with an ageing population, if New Zealand doubles its GDP by 2050.
Using the figures in this University of Auckland report (again, using 2013 numbers), New Zealand's GDP is expected to actually nearly quadruple by 2050 - from $265bn to $1002bn. In that same time, though, the cost of superannuation (after tax) is estimated to rise to $61bn - meaning it will account for 6.1 percent of GDP. If GDP only doubled, then superannuation would account for 11.5 percent of that.
Fact or Fiction: A superannuation special
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