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My opinion is that a virtual central bank is mandatory in this case, in order to pump virtual coins, when needed, and keep it away from speculations. For instance, if I have 5 millions of dollars, I buy ethereum and bitcoin, the price goes crazy high, as the cryptocurrency is limited and sell it in a week, getting the maximum profit of it. But, this way, the market gets high and crashes after a short while.

I can't easily explain the mechanics, but Steem has a nice way of preventing SBDs from dropping below $1, but no equivalent function for preventing speculative pumping. Resolving this problem seems a bit difficult partly because a policy response would require consensus among the witnesses, or blockchain software changes that are difficult to agree on.

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