Mary Buffett is one of the few people who has had long, close contact with?

玛丽·巴菲特是仅有的几位与巴菲特有长期而又亲密接触的人之一。

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But, according to Mary Buffett, Warren Buffett has used some quantitative measures to find companies with those enduring moats.

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While Buffett was speaking in generalities, it got me wondering how ADM, GD, and EXC stacked up against my Buffett-inspired Guru Strategy, which is based on the approach Buffett used to build his empire (a strategy that Mary Buffett, his former colleague and daughter-in-law, disclosed in her book Buffettology).

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