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SBD is always worth a dollar in the blockchains calculations. The value you are looking at is the exchange price that people trade each other for.

Interest is set to 0% by most of the witnesses right now.

That is because they changed the vision after the original whitepaper was published. Apparently most groups don't update their white paper. SBD is supposed to be not more than a specific percentage of Steem's market cap, so when it gets over that point, SBD stops printing. If it gets past 10% of Steem's market cap, then it (goes off of Steem's price, not off $1 in terms of whether or not interest is given). I'm not sure on the last part. There haven't been clear explanations for it.

Personally, I think SBD should be $1. Period. It would incorporate a stablecoin element to Steem which would make it more attractive for businesses to use Steem because they could charge in SBD and know they're effectively getting $1.

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STEEM 0.28
TRX 0.12
JST 0.034
BTC 63214.03
ETH 3274.73
USDT 1.00
SBD 3.86