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You aren't forced to use US dollars for anything. Ever. You never need to own one or to touch one. You never need to account in them, measure in them, or be so much as aware of their existence.

If you voluntarily choose to use them, for anything, or find them convenient, for anything, then they benefit you. You may wish you also got free pie and ice cream, but if you freely use them, then the US dollar is a net benefit to you. Other people finding them extremely useful probably would be what prods you into using them yourself. Since your average checkout lady at Walmart wouldn't really know what to say about your sack full of crumbling blueberry scones. But you are free to try, and Walmart is free to tell you to stop wasting its time.