There’s a neat bit of symmetry in the fact that Apple and Berkshire Hathaway are both in the midst of chief executive transitions that will define their next three decades.

At Berkshire, Greg Abel has just taken over running the world’s most famous conglomerate from the world’s most famous investor, Warren Buffett. A profile of Abel in The Wall Street Journal this week – complete with photos of a frail Buffett – painted a picture of a company in a state of mild but predictable flux, as Abel gently tries to put his stamp on a business Buffett had run in a decidedly idiosyncratic way for 55 years.

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