Representatives from supermarket powerhouse Woolworths deny its huge market share is costing suppliers an opportunity to negotiate when selling products.
The consumer watchdog could divest some of Australia's biggest brands if found to be price-gouging and anti-competitive, under a federal opposition proposal.
Customer shopping patterns have shifted since the start of the year as rents rise and Australians seek savings, Woolworths chief executive Brad Banducci says.
The head of Woolworths was threatened with jail time while the Coles CEO apologised to suppliers during a parliamentary inquiry into supermarket prices.
Brad Banducci is leaving the Woolworths group after eight and a half years as its chief executive, and will be replaced by WooliesX head Amanda Bardwell.
Australia's two supermarket giants have been put on notice by Anthony Albanese who has warned them the public's opinion of them matters to their business.
Woolworths chief executive Brad Banducci has backed the supermarket's choice not to stock Australia Day merchandise as staff report more and more abuse.
Another supermarket chain has joined Woolworths in choosing not to sell Australia Day merchandise in a move that sparked opposition calls for a boycott.
The federal opposition has been condemned for "fighting a culture war" after supermarket giant Woolworths pulled Australia Day paraphernalia from shelves.