Comment by cogman10

> Refreshing the content on an electronic shelf label (ESL) takes about 30 seconds

Today's, yes, but that's really not a technology limit. EInk displays have much faster refresh rates. The main limitation is the communication, but that's a solvable problem with a smart enough networking mesh.

> multiple people can view a product simultaneously

You track the people's position. If multiple people are crowded around the same product then you can pick a price for both customers. Might not work well for crowded stores, but in that case you probably can just maximize the prices anyways as a lot of people are currently shopping.

> This assumes you have sufficient data to actually recognize a shopper such as facial ID or some form of iBeacon for every single product.

No, you just need 1 customer ID on entrance to the store. Everything else can be done by tracking their position with overhead cameras. You don't need to put a camera on every product.