请教一道OG逻辑题，谢谢

yibiaobiao

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.

为什么E不可以呢，既然工作效率提高了13%，但是工人工资上涨了15%，这样相对来说，效率是降低的而非提升，直接削弱啊？

sdcar2010

Reading comprehension.

The conclusion is PRP contracts increase worker productivity. So the focus is on PRODUCTIVITY, not pay scale. E says nothing about PRODUCTIVITY.

既然工作效率提高了13%，但是工人工资上涨了15%，这样相对来说，效率是降低的而非提升，直接削弱啊？ No. As you just said, the productivity increased! You are thinking about profitability, which is a totally different category from productivity. Even so, the profitability is not necessarily lowered because of the rise in salaries.

yibiaobiao

有道理 ，谢谢 ^_^