Relevant Law: https://www.law.cornell.edu/uscode/text/31/5103 https://www.law.cornell.edu/uscode/text/31/5103 Good explanation: https://www.forbes.com/sites/na

Relevant Law: https://www.law.cornell.edu/uscode/text/31/5103 https://www.law.cornell.edu/uscode/text/31/5103 Good explanation: https://www.forbes.com/sites/nathanlewis/2017/04/18/what-is-a-legal-tender-law-and-is-it-a-problem/ https://www.forbes.com/sites/nathanlewis/2017/04/18/what-is-... Another distinction here is that a store is offering a contract. It isn't a debt until the contracted is accepted.