当需求确定时，买方垄断者采用部分一体化来减少成本支出，但此时存在生产的无效率；
When demand is certain, monopsonist will make partial-integration decision to reduce its cost, and there is some inefficiency in production from monopsony.
该方法减少了物料的无效循环，显著提高设备的生产效率。
The method reduces futile cycle of materials, and remarkably improves the production efficiency of equipment.
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