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Re:Sugar industry secretly paid for favorable Harvard research by aninhumer on Tuesday September 13, 2016 @08:23AM (#12487469)
I don't think that anywhere requires particular denominations to be accepted by law. If you're referring to "legal tender" laws, or similar, that's to do with settlement of debts.
Re:Sugar industry secretly paid for favorable Harvard research by 77pt77 on Tuesday September 13, 2016 @08:46AM (#12487654)
Several countries in Europe undoubtedly require businesses to accept all denominations of euros with the qualification of denying change (for obvious reasons, try paying 10EUR with a 500EUR bill).

Some places limit the number of coins you can use (there were people paying fines with hundreds of coins).