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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.
Should be against the law the change the price after the shop opens at something like a grocery store. Nobody should be able to shop anywhere where the price you pick it up at can change by the time you get to the checkout.
Edit: Maybe there could be some exception for mid day price changes if you emptied the entire store of customers first, but enforcing something like that seems difficult.