其二是鲁宾逊夫人提出的效率单位（efficiency unit），以异样分娩效率算分娩要素的单位，很少人用，而在卷四理解件工合约时，我会指出夫人是用错了。这两种算法皆无视了另一个去处。
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这一切必定花费高昂，但张女士坚持认为，规模愈大，效率愈高，而且每单位产量的成本也愈低。
All this is inevitably expensive, but Mrs Cheung insists that greater scale creates greater efficiency and reduces the cost per unit of output.
要改善用水效率是绝对可行的，且富裕国家的工业人士早就在做，为每一顿钢铁节省用水，以增加国民所得的每一个单位(见下图)。
Improving efficiency is doable and industrial users have done it, cutting the amount of water needed to make each tonne of steel and each extra unit of GDP in most rich countries (see first chart).
据此逻辑，提高效率而压缩单位成本的方法就是限定产品种类，并且进行标准化批量生产。
According to this logic, the way to increase efficiency end drive down unit costs is to limit product variety and produce a standardized product in large volumes.
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