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Yes, but are market movements that are gradually reabsorbed. See this chart:

sbd.jpg

Is the same of my post

https://steemit.com/steem/@miti/steem-dollars-at-usd3-20-impact-on-steemit-community

Compare that chart to this one, showing BitUSD price over the last year. BitUSD keeps USD peg much better.

You got a point there, @slavix