Emerald Eggs in Carnarvon supplies its supermarkets across Western Australia's north west with free range and caged eggs, reports ABC.

Manager Carl Wright says it'll be good for his business if there are fewer caged eggs available on the shelves.

"We're mainly free range, out of 10,000 birds we only have 2,000 in the cage, which we've been phasing out over the last couple of years anyway," he says.

"So for me that's all good, but I can understand for other perspectives, all caged systems that other people have, it will affect them greatly, because Woolworths is a big player in the industry."