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is it really that true ? please answer i am bit worry about the price of SBD because it decreased 13$ to 3$

Speculating on SBD wouldn't be financially wise. SBD is a debt instrument whereas STEEM is ownership stake in the network. I have an introductory post on this, but you can gain a better understanding by reading pg. 8-12 of the whitepaper for yourself! Cheers