What are the attributes the attributes that a money item has to have to function well as "money"?

Answer 1

Hmm well it has to be

1) easy to carry
2) distinctive in design--easily identifiable amounts etc.
3) hard to counterfeit
4) sturdy--hard to destroy
5) reliably backed--it can't be changing "value" too quickly or people will never want to accept it for fear it will lose it's value in a month or year or so.