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there are 2 currencies for the steemit platform...SBD steem dollar coin fluctuates daily. The other coins is steem which also fluctuates daily. The steem coin is used for steem power. These coins are constantly being traded at exchanges. The price goes up and down depending on how much people buy and sale it at exchanges. I believe that the steemit platform averages the ongoing sbd price of the post per 7 days. I might be wrong on the days it's averaged out. It could be 5. That's why you see the price changing all the time. If all the steem coins go much higher the more money you will make.

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