CNBC Contributor Peter Boockvar of The Lindsey Group sees the market a little differently.
He doesn't think it's Ebola; on CNBC's "Street Signs" he said it was QE.
"The last two times we ended QE the market fell 15 to 20 percent," he said. "A $1 trillion stimulus program goes to $0 this month. That is the overriding factor in the weakness."
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Whether it's Ebola, QE or something else entirely, Jim McCaughan of Principal Global Investors thinks investors should look at these sharp declines as an opportunity.
Also on "Street Signs" he said: "I think the selloff is technical not fundamental. A rational investor should buy dips in select stocks."
Kimberly Foss of Empyrion Wealth Management said much the same. "If you're a long-term investor and you're diversified, you can add to positions on this selloff." On CNBC's "Closing Bell" she added that although the decline isn't pleasant, she views it as a healthy correction, one that was much needed.
And if you don't have the stomach to buy stocks right now, "Fast Money" trader Joe Terranova of Virtus said on "Closing Bell": "Sit back and let this play out. The market needs time. What happens over the next few weeks will be telling. There are also positives on the horizon."