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you'll have sell on one side as fast as possible to buy more of the other side.

Which exchange will support the new Steem or do we support Bitcoin?

I don't see why exchanges wouldn't support it, Most likely none at start.

Yes they do, maybe they don't lists scamcoins with pre-mines for free through.

Okay, but who's gonna cover that amount in hive? So scamcoin with pre-mine / ninja-mining? :P