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"If the restaurant proprietors are dumb enough to let you eat first and then say they don’t accept cash they’re SOL, but if you have to pay ahead of time to get the service they can specify unicorn piss as the exchange medium if they so desired."
Yes, legally they can, without a doubt. It’s stupid, but their prerogative. The only way they could be compelled to accept the FRNs is if they provided the good or service first and allowed the other side of the transaction to have incurred a debt.