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.

@Varon it gets even better:

On 06.01.2021 I received an email that an item on my watch list (this coffee machine) had become cheaper. In the email dated 06.01.2021, the price was reduced from CHF 656 to CHF 599 (which corresponds to a reduction of 8% and was also communicated as such in the email). Excitingly, last night (from 07.01 to 08.01.2021) the price was corrected upwards from CHF 656 to CHF 659 on the Digitec Galaxus website so that the price reduction is now 9%. Adjusting the original price of the coffee machine upwards so that the discount is "higher" - is this how Digitec Galaxus constructs the "best price" for their customers?

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.