Why don't banks print their own paper money / bank notes?
In Scotland, each bank issues its own separate notes. It's not uncommon to see identical-valued £10 notes, for example, from three different banks in one's wallet.
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### Instruction:
Why don't banks print their own paper money / bank notes?

### Response:
In Scotland, each bank issues its own separate notes. It's not uncommon to see identical-valued £10 notes, for example, from three different banks in one's wallet.