What was the cause of this correction? Hard to say. There may have been a boost generated by the decline in Nasdaq tech stocks. There have also been negative comments from the new Secretary of the Treasury, Janet Yellen. Or a tweet from Elon Musk suggesting that the price of Bitcoin is high. But the explanation is probably much simpler. It is simply a technical pullback after an excessively steep rise. Add to that optimistic, ultra leveraged traders, and you have a fireworks display.