Reserve Bank governor Alan Bollard says it is unrealistic to expect New Zealand to match Australia's income and wealth.
Dr Bollard made the comments on TVNZ's Q&A programme.
"I don't think we can catch up with Australia," said Dr Bollard. "Australia is a most unusual country. Australia has been blessed by God sprinkling minerals across the top of the surface in very easily accessible areas and places where it does not annoy people to mine them. China is there buying all that.
"It's not rocket science - they have run their economy well, but we just don't have those advantages."
The Prime Minister's office says the Government is sticking with its goal of matching Australia by 2025.
John Key is expected to signal changes to the tax system when Parliament resumes on Tuesday.
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