I once wrote a column headlined “Buffett deserves his D-grade”. It prompted a one-line e-mail from Jim Cramer, the CNBC investment pundit: “You have cojones.”
Not that my assessment was particularly ballsy: the D was Warren Buffett’s own self-critical grade in March 2000 for his capital allocation decisions the previous year. And, of course, I was wrong. Publication of that annual letter to shareholders called the trough in the share price of his Berkshire Hathaway and the peak of the internet bubble. As Mr Buffett pointed out in the same letter, he and vice-chairman Charlie Munger had avoided technology sector investments because they had “no insights into which participants in the tech field possess a truly durable competitive advantage”. It turned out they weren’t alone. Read more

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