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As Dow tanks, here is Warren Buffett on the biggest puzzle for investors

Eric Rosenbaum

Warren Buffett's Berkshire Hathaway recently repurchased close to $1 billion of its own stock, a move made after the billionaire investor changed the trigger he uses for stock buybacks. Intrinsic value is a concept that Buffett has talked about a lot over the years, but it is not an easy stock market valuation method for investors to master, though it is important at times of elevated asset prices.