"The issue is what the hangover is likely to be, and how much is going to be given back in November."
Government data for spending on electronic cards showed a pick-up from the sporting tournament, and third-quarter retail spending volumes grew faster than expected amid the inflow of tourists arriving in New Zealand for the Rugby World Cup.
"Imagine if we hadn't had the Rugby World Cup, things would've been pretty poor," Bagrie said.
Bagrie said New Zealand's economy was better-placed than other nations, as households use record low interest rates to repay debt and improve their savings and strong commodity prices underpin nationwide earnings growth. Still, any global downturn will hinder the nation's economic recovery.
"It's coming together in really grumpy growth," he said. "We're holding up well but, it's scratchy."
Total advances outstanding on New Zealand credit cards rose 0.4 per cent to $5.46 billion, the most since February this year.
Overseas spending on New Zealand cards rose 2 per cent to $303 million in October.