Witness the tenacity with which almost all clung to the theory of efficient markets throughout the 1970s and 1980s, dismissively calling powerful facts that refuted it “anomalies.” (I always love explanations of that kind: The Flat Earth Society probably views a ship’s circling of the globe as an annoying, but inconsequential, anomaly.)

The Great Bubble ended on March 10, 2000 (though we didn’t realize that fact until some months later). On that day, the NASDAQ (recently 1,731) hit its all-time high of 5,132. That same day, Berkshire shares traded at $40,800, their lowest price since mid-1997.

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