一道OG中迷糊的题--OG-146

productivity 和cost 之间有公式吗?( 针对选项B想到的问题)

我觉得虽然题目有些长，但是逻辑关系挺明显的：

作者认为，由于使用PRP的那些metalworking industry的profit比不用的要高出13%---〉使用PRP的话，能够提高生产力。

weaken的时候，D就是直接weaken了他的前提，其实metalworking industry大部分根本就没再用traditional的了，基本都改成PRP了，所以肯定不是PRP的原因让生产力提高的。连他推理前提都被weaken了，当然整个逻辑推理就不再是正确了。

though know that the increased productivity is not due to the prp contract,but  how to understand choice b:Under PRP contracts costs other than labor costs, such as plant, machinery, andenergy, make up an increased proportion of the total cost of each unit of output?

for og explains :choice b is incorrect because it is a natural consequence of increased worker productivity if other costs remain stable?where we can see other costs remain stable?

(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.

意思是PRP contracts costs  弥补了每个产品的总成本的增加, 比如原来要增加20%的总成本, 用PRP contracts costs 后只增加10%.

而 OG说的 Choice B is incorrect because it is a natural consequence of increased worker

productivity if other costs remain stable.  是说除PRP contracts costs  以外的其它成本都保持不变的话, 提高员工的生产力自然会弥补了每个产品的总成本的增加.

B是无关的支持. 请NN们指教!