'May Scale' of monetary hardness
Hardness
Item
1
Street cash, US dollars
(Hard)  
2
Street cash, euro currencies, japan
3
e-gold
4
Street cash, other regions
5
Interbank transfers of various sorts (wires etc), bank checks
6
personal checks
7
Consumer-level electronic account transfers (eg bPay)
8
Business-account-level retail transfer systems
(Soft)  
9
Paypal and similar 'new money' entities, beenz
10
Credit cards
(Ridiculously
soft)
 



Three essays from different periods follow