Comment: They must have plenty of good

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In reply to comment: Lets stick with your premise (see in situ)

They must have plenty of good

They must have plenty of good public faith, since they keep coming back over and over again. People use paper for a while, then people use metals for a while, then metals come back, then paper comes back. A fiat currency could be gold...

Please come join my forum if you're not a trendy and agree with my points of view.