Japanese retailers using electronic paper to post prices

With inflation suddenly an issue in the U.S. economy, American shopkeepers may want to take a cue from Japan, where retailers are testing an electronic paper-based system that lets them change posted prices based on data fed to the shelves from a central server. The displays were created by tire company Bridgestone, and use a substance they call Electro Liquid Powder, which Bridgestone claims is brighter and more easily viewable than comparable LCD displays.
While a system like this would allow on-the-fly pricing changes and virtually guarantee that posted prices match what you're charged when you get to the register, we're still convinced that our local superstore would somehow make a mess of it and charge us, say, $10 for a pack of gum, and then chalk it up to "computer error."