Abstract: System for selecting and purchasing products or services at a fixed price, characterised in that it comprises a first means organised for containing a plurality of second means for presentation of a product or service of one and the same type, each product or service for which a second presentation means is contained by the said first means having an identical fixed price paid by the acquirer of the system, and in that the system also comprises a third means for ordering a product or service chosen from amongst those for which a second presentation means is contained by the first means.