Berkshire Hathaway's earnings can swing wildly from quarter to quarter because it has to record the current value of its massive investment portfolio.
Warren Buffett steps down as CEO of Berkshire Hathaway, says Greg Abel should be successor
Warren Buffett's company reported less than half as much profit in the second quarter as it took a $3.76 billion writedown on the value of its stake in Kraft H... [4163 chars]