"Kaufen": To acquire or acquire. This emphasized the mutual transaction of cash in opposition to a commodity in unambiguous terms (Okay, it can be utilized metaphorically as well in the same style to English: "Das kauf' ich Dir nicht ab" = "I do not buy [=imagine] that"). Use LEO’s reference https://mediaexpressway.com/customized-medicare-solutions-tailoring-your-health-coverage-to-fit-your-needs/