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SBD is capped at 10% of the marketcap of STEEM AFAIK. SBD is a debt instrument that is a claim on 1USD worth STEEM. The debt level is meant to be at 10% of the total value of STEEM. Hence 10% of the marketcap of STEEM. In about 10 years STEEM inflation will go down to 0.95% and it'll stay there. So both are infinite (sort of).

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