Spending on consumables rose 1.1 per cent on April to be 5.8 per cent up on May last year. "Population growth is driving increased spending on necessities such as groceries," said ASB economist Christina Leung.
Sentiment surveys had found the high level of consumer confidence was reflected in spending in discretionary areas such as hospitality, which rose 1.5 per cent in the month and 11 per cent over the year, Leung said.
Spending on consumer durables, which had been flat over the previous six months, perhaps reflecting declining activity in the housing market, rose 1 per cent last month to be 3.4 per cent ahead of May last year. Apparel sales reversed April's decline, rising 2.2 per cent.
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The cold weather is likely to have prompted people to update their winter wardrobe, Leung said. Spending on fuel rose 2.8 per cent partly reflecting higher petrol prices over the month.
Infometrics economist Matt Nolan said overall retail spending appeared to be rising at a pace sustainable on the basis of rising household incomes.
"We expect consumer spending growth to stay tied to income growth over the next two years, as households remain wary of increasing borrowing levels too strongly."