He says he isn't sure if online shopping will ever be a substitute for physical shops.

"E-commerce will be complemented by a significant bricks and mortar presence, whether it's books or clothes or electronics.

"Will Amazon have an impact? Yes. Will that impact be as large as what people think? No."

Last year, Kiwis spent close to $6b in electronic card transactions in the month of December, up 6.6 per cent on the previous year.

Chris Gudgeon, chief executive of Kiwi Property, which owns New Zealand's largest mall, Sylvia Park, says shopping centres are still in demand and occupancy rates remain high.

"Over the four years to 2017, e-commerce sales have grown at nearly three times the rate of in-store sales, and now comprise around 11 per cent of total retail sales in New Zealand," Gudgeon says.

"But, over the same period, we need to remember that in-store sales in New Zealand have grown by around $20b to $110b and they still comprise around 89 per cent of total sales."

Charging GST for products worth less than $400 bought online is top of many retailers' wish lists, and Retail NZ says it would be beneficial for local retailers and business generally.

"Retailers will be hoping that the Government carries on and does go down the track and make the likes of Amazon pay its share of GST - that would be a really good present for the retail sector," says the organisation.