Perusing the grocery aisle in the Westside Market on 23rd Street in Manhattan, you might not even notice the screens. They look just like paper price labels and, alongside a bar code, use a handwriting-style font we’ve come to associate with a certain merchant folksiness. They’re not particularly bright or showy. The only clues that they’re not ordinary sticky shelf labels are a barely distinguishable light bulb and, on some, a small QR code.

These are electronic shelf labels, chip-enabled screens........

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