The Reserve Bank is at odds with the Government over promises of large future pay-offs from the Rugby World Cup.
Rugby World Cup Minister Murray McCully says New Zealand stands to gain substantially from the legacy value of the event - the business generated from a better awareness of New Zealand.
But the Reserve Bank says it may not be possible to know whether there will be long term benefits.
Senior economics advisor Michael Reddell says international studies suggest New Zealanders should not be too optimistic about cashing in on the exposure during the Cup.
And he says the high New Zealand dollar is making that even more difficult.