Why Is Warren Buffett Buying Back Berkshire Hathaway Stock?.

By DailyFinance

Earlier this month, famed billionaire and Berkshire Hathaway (BRK-A) (BRK-B) chairman Warren Buffett dropped a bombshell.

Breaking with past practice, and changing the financial rules he himself laid down, Berkshire is buying back its own stock -- and plans to keep buying back its stock at any price up to and including 1.2 times "book value."

What's book value?