The Government expects new supermarkets to pop up in months, rather than years - with planned reforms.
It's introducing legislation to pass before the end of the year to allow supermarkets that boost competition to be up for fast-track approval.
Finance Minister Nicola Willis says supermarkets can also apply for streamlined building consents.
"Really, it's just a matter of how quickly they can build."
Costco's confirmed its looking at opening new stores in New Zealand, after success in West Auckland.
Meanwhile, the Government's looking at the costs and benefits of breaking up the supermarket duopoly.
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