QR code money

An interesting idea and question from QR Arts.
One day, pounds and euros will be printed with QR codes to allow for people to see current fluctuations in bank note values with respect to the international market, printing plant of orgin, and other information about the country of which it was issued. Although money will become more electronic, why not have a link between our currency and the electronic medium that determines its value. This could be particularly useful for empowering tourists for exchange rates, and helping them determine the value of a good in their native currency. There are many opportunities for this idea.
The immersive nature of current mobile phones and the fact that people handling currency transactions in a foreign country tend to want both hands free (and all their attention on their money) would make its usage unlikely. There are other possibilities beyond a realtime link to currency data - background information on the bill itself or currency exchange locations come to mind.

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