Local retailers are being spooked by the "Amazon effect" according to research by Massey University on the Big Issues in Retail.
A survey by the university found business confidence had fallen since 2016 and the global online retailer is being cited as the main reason for uncertainty.
Jonathan Elms, lead researcher and a professor at Massey, said the comments in the open section of the survey showed retailers were concerned about Amazon establishing a presence in New Zealand and possible changes to the tax system.
"Amazon is a very large, efficient retailer that is able to do things cost-effectively. But it is going to appear even cheaper because they're not paying GST on their imports under $400 into New Zealand.
"Domestic firms see that as a double disadvantage to their business."