"Kaufen": To acquire or buy. This emphasized the mutual transaction of money from a commodity in unambiguous terms (Okay, it may be used metaphorically in addition in a similar manner to English: "Das kauf' ich Dir nicht ab" = "I don't buy [=believe that] that"). I also propose the Cordwood https://shop09763.wikisona.com/811063/how_massiv_can_save_you_time_stress_and_money