Old Warren Buffett: "Never Invest in a Business You Cannot Understand"

Young Warren Buffett became rich in anonymity - but in the 1980s he became a global star. During the excesses of 1980s Wall Street the middle-aged investor was reluctantly drawn into the spotlight to save troubled companies. And then came tech - which suited Buffett's style even less.

Warren Buffett couldn't even use a computer - but everyone was telling him to buy tech stocks. How did Buffett navigate the dot com bubble when he'd never surfed the internet? And what will his company Berkshire Hathaway do in the era of AI as Buffett steps away?

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