> The retailer's purpose for a price tag is to grab your eye and get you to buy more. I'm not sure that's really true. What a supermarket like Tesco wants to

> The retailer's purpose for a price tag is to grab your eye and get you to buy more. I'm not sure that's really true. What a supermarket like Tesco wants to do is sell stuff at a high price to people who don't care about the price (there are a lot of such people) while having stuff available at a low price to people who will only buy it if the price is competitive (there are also a lot of those people). One way to do that is to put the expensive stuff at eye level and the cheaper stuff on the bottom shelf. Another way to do it is to have periodic offers: some people will buy certain products only when they're on offer. Yet another way to do it is to make the prices hard to read or hard to compare. And the shops do that, in my experience. E Ink could be another tool for that. "Almost illegible from a distance of more than 40 cm" could be a selling point.