As emotionally wrenching as the market gyrations have been, the only unusual thing about them is that they happened in such a short period. Over the course of a year, the Dow fluctuates more than 15 percent about half the time, says Ed Easterling, president of Crestmont Research, an investment research firm, and author of "Probable Outcomes." The seesaw movement "feels more dramatic, because we went through a period of relatively low volatility and almost all the volatility has been to the upside. It's not historically inconsistent."
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