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I hadn't thought about the linked value like you described. I understand that the system adjusts how many SBD are created if the ratio of Steem to SBD goes over 10%. I am not sure how this factors into the equation.

the system adjusts how many SBD are created if the ratio of Steem to SBD goes over 10%

AFAIK it's not the "system" but the price feed bias set up by witnesses. Initially it was 5%.

If it ever gets to 100% then we will get STEEM by an SBD proxy. Much like people who will trade Bitcoin futures will never hold Bitcoin, but a contract about Bitcoin.