True, but Gresham's Law still applies:
"The course our city runs is the same towards men and money.
She has true and worthy sons.
She has fine new gold and ancient silver,
Coins untouched with alloys, gold or silver,
Each well minted, tested each and ringing clear.
Yet we never use them!
Others pass from hand to hand,
… These we spurn for men of brass …”
The Frogs, Aristophane
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Bad money drove out to good because people couldn't use only good money (divisibility, laws) so there was always some bad money in circulation.
With bitcoin this isn't necessary anymore as you can store your full wealth in it and do every transaction in bitcoin. No need to hold bad money anymore, so you can only spend good money.
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