Warren Buffett stepped down as chief executive of Berkshire Hathaway (NYSE: BRKB)(NYSE: BRKA) on Jan. 1 of this year, handing the job to Greg Abel, the executive who spent years running Berkshire's energy and non-insurance businesses. Buffett is still chairman at 95 and still writing his annual letters, but the decisions belong to someone else now. That makes it a good moment to think about what the man taught rather than what he happens to own.Image source: Getty Images. Missed Nvidia in 2009? This Rare Signal Is Flashing Again. In 2009, a "Double Down" signal flashed for a little-known chipmaker called Nvidia. For the first time in years, that same "Total Conviction" signal is flashing for a company 1/100th the size of Nvidia.
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