"Kaufen": To order or acquire. This emphasised the mutual transaction of money against a commodity in unambiguous phrases (Okay, it can be utilized metaphorically in addition in an analogous trend to English: "Das kauf' ich Dir nicht ab" = "I do not buy [=think] that"). I also recommend the Cordwood https://jaspermrwad.signalwiki.com/795556/how_holz_can_save_you_time_stress_and_money