SYDNEY -- In regular ads filled with images of happy families and enthusiastic staff, Australia's two biggest supermarkets, Woolworths -- better known as "Woolies" -- and Coles, like to tout their fresh produce and low prices.
But as the cost of living rises, the rival chains, which comprise more than 60% of the supermarket sector, have increasingly had their consumer-friendly claims challenged by allegations they abuse their powerful position.
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