Since I entered the business world, conglomerates have enjoyed several periods of extreme popularity, the silliest of which occurred in the late 1960s. The drill for conglomerate CEOs then was simple: By personality, promotion or dubious accounting — and often by all three — these managers drove a fledgling conglomerate’s stock to, say, 20 times earnings and then issued shares as fast as possible to acquire another business selling at ten-or-so times earnings. They immediately applied “pooling” accounting to the acquisition, which — with not a dime’s worth of change in the underlying
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