by 
Adz3r0
ANSWERS: 4
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For accounting purposes I would assume.
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Tracking and accountability of the currency and identification.
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The original reason is simply to make forgery harder. Forgers cannot use a simple copying mechanism, they have to have machinery to give each note a unique number - and the same number at several places on the note in different styles. And once the number ranges that forgers are using get known, systems can be set up to watch out for them specifically, Also they can be used to detect when large numbers of new notes are stolen. If notes are issued to banks in large blocks, and a shipment of new money is stolen, the a warning can be put out for these numbers. This makes stealing such large issues much less worthwhile, and hence shipping them around safer and cheaper. (And hence why criminals demand ransoms in used, i.e. not contiguously numbered, notes).
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To know the fakes.
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