Question about Philips 5400 series EP5441/50

Dynamic pricing, also known as surge pricing or dynamic price management, is a pricing strategy in which companies adjust prices for products or services based on current market demand.It is a model that calculates prices using automatic algorithms. Factors such as competitors' pricing, supply and demand and other external factors are included. Behavioural factors must also be taken into account.

It is also called rip-off.

Look at the prices today after 3 years, it's getting more expensive than cheaper.

Really fine. The item is still in the post and the price went down. If I'm looking for something like that, I'll go to the stock exchange. It's not the customer's fault if you work with several suppliers.
Mixed calculations across all suppliers could cushion the fluctuations.

We work with different suppliers and daily prices. For this reason, the price of an item may be adjusted up or down over time.