“一个人抽铁丝，一个人拉直，一个人切截，一个人削针尖，一个人磨圆另一端以便装上针头。仅装针头一项，就包括两三道工序，装针头，把针涂白。甚至外包装，都成为专门的职业。如此一来，制针的流程就包含了大约18项操作。……平均下来每人每天生产针4 800枚。”《国富论》中记述的这一现象( )
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