After falling for nine straight days, shares of Warren Buffett's Berkshire Hathaway have dropped almost 50 percent from their all-time closing high set last December. Berkshire closed today at $77,500 a share, down $6,500, or 7.7 percent. It's a fresh three-year low. Buffett's reputation as the world's greatest investor means the stock's big fall is getting lots of attention as some investors ask if he's losing his touch and other's defend him.
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