With that technology, no. But retailers track where you are in their stores. And even if you don't bring your phone with you, they're using facial recognition technology and will eventually try working with that.

So they probably have a good idea who you are. And they also have your purchase history - what you bought and at what price you bought it. They have your frequent shopper card history, your online purchases, everything they've put together from data aggregators.

They have all the pieces: they can track you in the store, they know the prices you're willing to pay for things, and they can change the price as you walk down the aisle. Do you seriously think someone isn't going to start putting all that together?