Actually, they'll start with surprise specials and flash deals, like KMart used to do with their blue light specials. They will use it to discount over-stock as it gets near the sell-by date.
And then, once they've got you used to the prices changing at random times, maybe even getting people to come back in shop in the store more often but offering really great deals (like black Friday started out) . Then they will begin to have "peak pricing", where you pay more on busy days and times.

no, they detect autism