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https://www.tampafp.com/fake-100-bills-showing-up-in-florida/

Black markets are where people are most likely to need to use paper currency and want anonymity. Black markets are likely to be the last hold outs for cash transactions

Black markets are also very easy for them to flood with counterfeits with zero traceability. This directly targets the right people and destroys their faith in paper currency. This also helps drive hyperinflation and the death of the dollar.