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thx. that's what I guessed.
moreover, the circulating amount of SBD can't increase simply after the demand, can it? (I'm not into the cryptocurrencies enough to understand it, I just use my knowledge about traditional monetary economics ;) )

No, there's a fixed amount of SBD that's "printed" (or "minted" if you want) every day by the Steem blockchain.

How did you gain access to all theseeee special knowledge?

So sir it applies here the supply and demand then? Very interesting we all looking forward for steem go go high. Tnx for this very interesting post of tips sir.