As I understand it, Steem Blockchain Dollars (SBD) are a debt instrument that are backed by Steem. So they were created to bring stability to the Steem blockchain. In their whitepaper they state that "token-convertible-dollars enables blockchains to grow their network effect while maximizing the return for token holders." So I'm assuming that because we have SBD it maintains stability with Steem while still rewarding the blockchain's users. But if anyone has a clearer answer, please let us know.
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Thanks for the explanation. That could be it, although SBD is currently just somewehere between 4 and 5 percent the market cap of STEEM and both are tradeable, liquid on the market and convertible into each other, so I personally do not see much reason for having two cryptocurrencies in Steem ecosystem.