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Electronic shelf labels likely to cost jobs and drive up grocery prices, US report warns
(www.theguardian.com)
This is a most excellent place for technology news and articles.
In my state the customer would be able to reference the last visible sales tag or printed circular if no posted prices. So some granny could have an ad from whenever this all started and basically have grandfathered in grocery prices until the manager finally decides he is losing enough money and starts putting signage up again.