Agonizing over errors is a mistake. But acknowledging and analyzing them can be useful, though that practice is rare in corporate boardrooms. There, Charlie and I have almost never witnessed a candid post-mortem of a failed decision, particularly one involving an acquisition. A notable exception to this never-look-back approach is that of The Washington Post Company, which unfailingly and objectively reviews its acquisitions three years after they are made. Elsewhere, triumphs are trumpeted, but dumb decisions either get no follow-up or are rationalized. The financial consequences of these
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