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Money must meets the following characteristics:
- Portable - Want to use whole tree trunks for money ?
- Divisible - Ever tried to make change for a live cow ?
- Fungible (Exchangible) - Can people agree on how much it is worth ?
- Durable - Grapes would not make good money ?
- a high ratio of value per unit of weight - A dollar's worth of lead ?
- What to do with it -- Socially responsible investing