"Kaufen": To acquire or purchase. This emphasised the mutual transaction of cash in opposition to a commodity in unambiguous terms (Okay, it may be used metaphorically at the same time in an analogous style to English: "Das kauf' ich Dir nicht ab" = "I don't buy [=believe that] that"). With https://nachrichtenexperte.de/die-vorteile-des-kaufs-in-einem-fachgeschaft-fur-massivholzbetten/