The same physical infrastructure that is also used for transporting just about everything else? Anyway, most currency transfer these days is digital, so even that doesn't hold much water.
We use armored cars and people licensed to carry firearms for the transport of "just about everything else"?
Also, most currency transfer being digital is a non-sequitor Businesses still need to move the money from their location to the bank regardless of the volume of transfers done digitally.
Also, most currency transfer being digital is a non-sequitor Businesses still need to move the money from their location to the bank regardless of the volume of transfers done digitally.