Schools turned out clerks who functioned as interchangeable parts in a vast bureaucracy where the skills of reading, writing and arithmetic were key.

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For the most part, they had been reduced to interchangeable parts.

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Yet Bernanke seems to possess some Keynesian baggage, using such nomenclature as "aggregate demand, " "core inflation, " "potential output" and "output gap, " as though the economy were made up of interchangeable parts.

FORBES: Fact and Comment

The difference between profit and loss in the car-making business lies in such boring details as easy-to-stamp panels and parts that are interchangeable between models.

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Production was centralized, and parts were designed to be interchangeable.

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