]Japanese news agency Kyodo was reportedly told by Hitachi that the
]ECB has started talks with the company about the use of its radio
]chip in the banknote.

When anonymous cash becomes less so.

]"RFID (radio frequency identification) tags also have the ability
]of recording information such as details of the transactions the
]paper note has been involved in. It would, therefore, also prevent
]money-laundering, make it possible to track illegal transactions
]and even prevent kidnappers demanding unmarked bills," Chopra said.

Because they won't figure out a different negotiable but less traceable currency...