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What is the rationale in 2019 for serial numbers on US currency?

Asked by elbanditoroso (33177points) December 2nd, 2019

These are printed alphanumeric characters on all your $1, $2, $5, $10, $20, $50, and $100 dollar bills.

Barcodes might make some sense for tracking. But just letters and numbers – no one is going to type those in for any reason.

Why do we still have serial numbers on dollar bills?

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