Major supermarket chains could be next in line after petrol companies to receive closer scrutiny from the Government after expedited market study legislation becomes law.
Prime Minister Jacinda Ardern said she "would not be surprised" if the Commerce Commission conducted a market study into the supermarket sector.
On Monday, Ardern announced the Government would prioritise the passing of the Commerce Amendment Bill so it would be passed in two weeks.
When law, it will mean the Commission will be able to undertake "market studies," which will compel companies to provide information proving they are behaving competitively.
Ardern said she will personally be nominating the petrol industry to be the first sector to be investigated.