http://www.inquisitr.com/660120/amazon-virtual-currency-arrives-for-kindle/
Mielenkiintoista. Onko raha palaamassa juurilleen? wikipediasta :
Development of the banknote began in the Tang Dynasty during the 7th century, with local issues of paper currency, although true paper money did not appear until the 11th century, during the Song Dynasty. Its roots were in [b]merchant receipts of deposit[/b] during the Tang Dynasty (618–907)...
http://en.wikipedia.org/wiki/Banknote
Tuo amazon coin on kyllä muuten hyvä idea, harmi vain että sillä ei voi maksaa ruokakaupassa tai alkossa. Nyt olisikin hyvä paikka jollekin nerolle kehittää jonkinlainen universaalimpi vaihtoehto!