Question about value of sp and sd

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I've noticed that even though I'm slowly slowly gaining both SP and SD, the dollar amount that approximates the value of my holdings has been dropping since the day I created my account. I know the value of steem compared to the dollar has been dropping, but I'm not holding steem,I'm holding steem power and steem dollars. So as the value of steem drops, does 1sp/sd equal less in dollars then it did a week ago?

Question about value of sp and sd | Ecency