It's actually so much worse than that.
With e-labels you can optimise your prices in real time, A/B testing the public across the country in minutes to optimise for the highest rate a population will tolerate indefinitely.
Then, you can offload the management of this service to a third party, which sounds daft at first, but this provides deniability when it comes to price fixing. When EvilCorp contracts with all grocers in a given province/state, they can slowly hike the price of bread by 1% every hour until they maximise profits, screwing you. They can even optimise for time of day/region/whatever, all with deniability.
Surge pricing is a distraction. The real profit is in squeezing the public slowly.

