well, if Venezuela is anything to go by they weave their paper money in to handbags and sell them for stronger fiat currencies
Zimbabwe is another example, 1 wheelbarrow load of notes = 1 loaf of bread
even if America crashed it would be highly unlikely all currencies crashed, if all currencies crashed all of the money would be worthless(apart from a few people who would buy a load of it just in case it became valuable again) ironically coins would be worth more than notes because metals have value, i would assume that in the event the whole fiat system going down globally we would simply revert to trading metals with silver being the main metal, copper, gold, and the platinum family would also be traded, for governments trading i would expect to see stuff like high grade refined radioactive material being traded as well as ancient artefacts and renowned works of art
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