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Dynamic pricing could be coming to your local supermarket
(www.abc.net.au)
This is a most excellent place for technology news and articles.
Yes, like I said.
They are not obligated to give it to you at the "wrong" price, but at the same time it's illegal to put up the sign if it's misleading with the wrong price on purpose.
They are then obligated to fix the sign, otherwise it's misleading.