Law of Library Science and the Labor-saving Principle, and connecting with the reality, discusses on the directive function of No.

简述了图书馆学第四定律和省力法则的内涵，联系实际，讨论了目前网络环境下第四定律对图书馆工作的指导意义。

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It is saving cost that creates the wealth ultimately. Smith's principle that division of labor creates wealth is only one way to save cost.

节约成本是创造财富的根本原因，斯密的分工创造财富的原理仅是节约成本的方式。

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