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The Steem dollar and Tether scenario is a fantasy, Steem Dollar would need to have at least circulating supply of at least 100 million and Steem marketcap an insane value, the Steem Dollar is doing just fine, a floor of 1 USD with upside potential that's how I see it, Steem needs SBD to curb its supply, I more see it as a tool to support Steem... Pegged base currency are used by exchanges, there aren't much merchants accepting them, if you find any let me know...

As Steem blockchain matures, SBD would mature as well, let's keep our fingers cross for the merchants accepting Steem, that's more important and HODLing within Steem, that would help stabilize price, hodlers hodling SBD and speculators taking a go at it, takes rocket fuel but SBD as it stands now is doing quite well