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Exactly
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Wont there be commerce between the planets, though?
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That's what I'm saying. There needs to be currency that is usable between planets in order to buy stuff from another planet.
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Sorry, I read that wrong.
Yes, you do want to be able to trade between planets.
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The problem there is that you want to be able to do commerce between planets. You could essentially replicate something like foreign exchange markets, but that's not as elegant as solving the problem entirely with bitcoin.