by 
Jen-Jen
ANSWERS: 5
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Australian currency enables a blind person to know what notes are what, by their length. The coins are all different too.
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The British currency has the shiny holograms, which are easily detected by touch, in different places and sizes on different notes.
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Depends what you mean. Note size can be varied but anything like braille markings would cause enormous problems with thickness and stacking of bills Perhaps some kind of RFID chip could be built in and a reader identify each bill. This would however give an opportunity for a whole new kind of forgery targeting blind people. To an extent coins already use different sizes and thicknesses - although often the progression is illogical (or lunatic) - as the American 1c/5c/10c coins where the 1c and 10c arw almost the same size and the 5c is largest, and UK where the 2p coin (around 3c) is about the largest coin...
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what about debit cards with a running balance display? in braille-like figures?
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Interesting question. The British currency already is accessible - each coin has a different shape and size and weight, the notes are of different sizes too. All are easy to identify by touch alone. If it weren't like that, as I guess in other countries it isn't, I would suggest that it should be.. definitely. Public buildings must be accessible to the handicapped, and so should currency IMO.
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