"E-cash shoppers at AM/pm stores, for instance, are laying out about 15 percent more per transaction than those paying with real cash"
Source: Japanese put their e-cards where currency used to be
by Anthony Faiola
The Washington Post
Monday 19th December, 2005
http://seattletimes.nwsource.com
Further Reading:
Book - Smart Cards, Tokens, Security and Applications
learn about study in Japan at Study Abroad Japan