“Usually counterfeit bills, from what I’ve read, are 20s.”
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Yes...Lesser denominations aren’t worth it and larger denominations are scrutinized more carefully.
That’s why $1 bills don’t make sense. I posit that they (all $900,000 of them) were “imported” for nefarious reasons.
I have long read the same thing, then I read that the paper is important, $1 bills can be bleached and a color copier can then make a $20.