Doesn't matter. You still need some condition to trigger price changes. No grocery is going to change the price of bread based on the wheat futures market, because no consumer cares about wheat futures. Maybe they'd change based on their own inventory, but they can't do that too quickly, or the price will change between the time customer picks up the product and the clerk rings it up.

There's a whole population of people who shop in advance - visit web sites, check the store fliers, whatever - to get the best price. If a shelf price doesn't match their researched price, they're never going to that store again.

Aside from gas stations, grocery stores seem to have the most volatile pricing. They're already making weekly changes on dozens of items, probably based on purchasing algorithms. Maybe that counts as retail "surge" pricing, but it's not the dynamics that people fear when talking about digital price tags.