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There is no inflation rate. The interest rate for Steem, not SBD, is set to 9% annually, I think, currently. The price of both coins fluctuates with the market. The price of Bitcoin has been the single biggest driver of that, but we seem to be stabilizing, even with Bitcoin still in a slump.

Coin Marketplace

STEEM 0.16
TRX 0.16
JST 0.029
BTC 60745.98
ETH 2342.23
USDT 1.00
SBD 2.52