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The nature of currency as commonly understood is that if you have it you can spend it, but bitcoin simply is not designed this way. In the absence of lots of compute power adding new blocks to the chain, it is easy to get "bitcoin traffic jams" which make it difficult to transact
An interesting thought experiment to close: imagine all bitcoin has been mined. How will anyone transact? If you don't get fresh bitcoin on adding a new block to the chain, why maintain the chain at all? Transaction fees will have to go up, but how much?
