Why is Steem Value Dropping?

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Can someone explain it to me in simple words and concepts? I am a Neanderthal about all this stuff, but this trend is alarming!

A month ago I had less Steem, SP and SD than now and it was worth just over $500

Yesterday more of the above was worth just over $400.

Right now it is worth $346.75

At this rate by the end of the week it will be worth $20, if I am lucky....