How would that work? I go to a shop and I know the price of what they are selling. It is not so easy to rapidly change prices without people noticing. There may be variations on vegetables, fish and meat according to availability but everything else has a clear price. Some products do have some seasonality or good and bad years but when I go to the shop I’ll mostly be accounting for those. It would be quite strange to go to the shop one day and buy something for 5€, the following time for 6€ and another time for 4€. You see, if I know this system is in place I will just not buy it whenever it is at an higher price. Moreover, changing prices while shopping is probably illegal. I am not sure about this, but I believe in Europe large shops are obligated to clearly state the price for every product. By changing the price several times per hour I do not think that would comply with such regulations. While personalised pricing itself may be legal, and I’m not sure it is, changing the stated prices while people are shopping probably isn’t. Besides, when I check out how will they charge me? This is 6€, no it was 5€ yesterday, you see the price changed to 6 while you were walking in front of it but it now is at 4€.