[nradov]

You're missing the point. Under US federal law, if I owe you a $100 debt and I hand you $100 in cash paper money then I have settled the debt. You cannot then sue me, demanding to be paid via Visa or PayPal or whatever. But this applies to debts only, not purchases.

[saghm]

I think you're missing my point! I'm not saying that the law doesn't actually require this; I'm just saying that there's nothing in general saying that something printed on every bill has to be true. In this case, it happens to be, but saying that it's printed on the bill isn't what proves it.

[nradov]

Nonsense. What's printed on the bill absolutely proves it. What kind of fantasy world are you living in?