Right. Although the notes are "legal tender", when you choose to buy something you essentially are independently contracting with the seller: "I'll give you goods if you give me whatever I want in exchange", usually money.

They can demand whatever they like because you are under no obligation to buy from them in the first place. They can say "Go deal with somebody else".

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL