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I'm sorry, who would stop banks from issuing paper Bitcoin? How?
I take that as inevitable.
Who? Users. No one in particular. We might be able to check them and keep them in line with regular bank runs, but only if withdrawal is possible and feasible.
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Some users will, some won't. And it'll happen. When people need money they don't have, they tend to bring it from the future via credit. What are their incentives to not do it?
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