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Proportionately to the STEEM market cap which mostly means STEEM price (since STEEM supply only changes slowly). So, in effect, SBD becomes pegged to STEEM once it passes 10%. So if STEEM then drops 10%, then the conversion rate for SBD would drop 10% as well (and vice versa). This assumes a constant SBD supply. There won't be printing so SBD supply can only change (decline) via conversions or burning. If it does then the reduction in conversion rate from a STEEM price decline would be correspondingly smaller, but that's probably a much smaller factor than movements in the STEEM price.

OK, thanks! That's clear.