What investors are you referring to? I'm not nervous, and pretty sure JFB, Redspeed, Gman, etc aren't nervous. There are some investors who believe fair valuation will occur at some point and are continuing to pick up shares at severely undervalued prices. Traders watch the hourly or daily trades and volume and comment on it. Investors look for ways to direct more funds to purchases.
I'm sure there are a few nervous investors. Watching daily price movements will wreck one's nerves if that's what you focus on.
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