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It's a circle... the higher is the price of SBD the more steemians exchange STEEM with SBD, less SBD are on the market the higher is the price of SBD. I wrote about it here:

https://steemit.com/steem/@miti/sbd-reaches-the-moon-i-think-it-s-written-all-over-the-walls-that

If we could only choose 100% SBD on our posts, that would help. :P

hahaha, I have been thinking about it too lately.