We’ve had them for quite some time. They don’t change price for individual customers, I don’t think they change the price in the middle of the day either. But, I guess, they can change the prices just before opening, like if the wether service forecasts a rainy day they could rise the price of umbrellas and raincoats. Cold? Hot chocolate and soups. Hot? Ice cream and cold drinks. Certain asshole died overnight? Champaign and confetti cannons through the roof. And so on…