>>http://www.bbc.co.uk/news/world-us-canada-23352230
>>
>>They wouldn't have needed to apologise to me :-}
>
>Is there that much cash in existence?
>
>Besides, Money has become virtual. It was once backed by the federal governments gold and silver reserve. now it is based mainly on what everyone agrees the bill is worth. A promissory note. Look at the top of any US bill or is it just a note.
>
>http://www.principiapub.com/

But you can put it in the bank and it is accepted as currency, just like gold and silver were. There is faith in the system.