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WTF? Electric shelf labels have been a thing in Europe for at least ten years. Prices don't change, though.

Yes also in Switzerland. Many are 3 color eink so if something is on sale it's yellow or red.

Also very isef6as they for example state that one need to buy 2 for the discount etc.

Makes the life of the store employees a littler easier.

Innovation I would like to see is individual tracking of items in order to digitally track expiration dates.

The Swedish company Pricer has done this since 1991.