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求助 og12-cr-116

Firms adopting "profit-related-pay" (PRP) contracts pay wages at levels that vary with the firm's profits. In the metalworking industry last year, firms with PRP contracts in place showed productivity per worker on average 13 percent higher than that of their competitors who used more traditional contracts.

If, on the basis of the evidence above, it is argued that PRP contracts increase worker productivity, which of the following, if true, would most seriously weaken that argument?

(A)    Results similar to those cited for the metalworking industry have been found in other industries where PRP contracts are used.
(B)    Under PRP contracts costs other than labor costs, such as plant, machinery, and energy, make up an increased proportion of the total cost of each unit of output.
(C)  Because introducing PRP contracts greatly changes individual workers' relationships to the firm, negotiating the introduction of PRP contracts is complex and time-consuming.
(D)    Many firms in the metalworking industry have modernized production equipment in the last five years, and most of these introduced PRP contracts at the same time.
(E)    In firms in the metalworking industry where PRP contracts are in place, the average take-home pay is 15 percent higher than it is in those firms where workers have more traditional contracts.

请问大家  b 怎么不对呢  我觉得 使用这种方法 使得cost增加也能驳斥原文啊   谢谢大家了~
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楼上正解啊。。。thx

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特地去看了一下OG,B是无关的.cost增加减少都和这个推理没关系.
有一部分题目说得情况那是五花八门天上地下的,但本质是一样的.比如这个,应该是先后发生两件事情之间的因果关系.原文认为效率提高是PRP的功劳,那驳斥的方法就是存在一个其他的事件,使得另一种可能性存在,即效率高上去是现代化造成的,和合同制度没有关系...

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