The classic properties
Economists usually list the same handful of traits:
- Durable: it doesn't rot, rust or fade.
- Portable: easy to carry or send.
- Divisible: you can pay for a minute, not just a day.
- Fungible: one unit is as good as any other.
- Verifiable: hard to counterfeit, easy to check.
- Limited: nobody can create it at will.