May scale of monetary hardness

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J.C. May defined the following scale of monetary hardness. The following is mostly his words, edited to bring them up to date.

May Scale of monetary hardness
Hardness
Hard
1
Street cash, US dollars
2
Street cash, euro currencies, japan
3
digital gold, gold whose ownership can be transferred over the internet
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



Three essays from different periods follow