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SBD and STEEM has almost the same equivalent at ~$2.00+ USD so that's why you're having exchange rates for SBD to STEEM at ~0.90 ;)

Oh ok makes sense, I thought the SBD was supposed to be pretty much exactly worth $1...

It was supposed to.. Turns out that the design didn't account for what would happen if there was extremely high demand for SBD, and traders were willing to pay more than a dollar for it.