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It have gone up from $.13

Steem doesn't have a sound economic model.

So, why this happens?

I think that you need to pay more attention to the fact that STEEM has moved slightly up and down in a very narrow range for at least a month. This is more within a normal range for it at this time.

It was only just a few years ago that bitcoin was only $1. STEEM is only just beginning its life.