关于helr老师说的因果不能用他因削弱

苏沐雨

我之前看到helr老师的笔记说如果是因果就不能用它因削弱，但在做题目的过程中遇到好多因果题目用它因削弱了（前提是我没有归错类别），求大神解答，逻辑瓶颈啊
                                                                                                                                                [size=10.000000pt]6. Adam will spend $4,000 to rent a booth at the town’s annual county fair to promote his new Sandwich Shoppe. Inprevious years, the average food booth at the fair served 400 customers. Thus, in order to cover his costs, Adamhas calculated that he must sell 400 sandwiches for $10 each. Which of the following statements casts the mostdoubt on Adam’s chances of breaking even at the county fair?
                                       

                                               
•                                                         [size=10.000000pt]Adam should not limit himself to 400 sandwiches; he should be prepared to sell more.
  
                                                 
•                                                         [size=10.000000pt]Adam has not factored in the costs of raw materials or labor in calculating the amount of revenue he needs to
                                                          [size=10.000000pt]generate to break even.
  
                                                 
•                                                         [size=10.000000pt]If booths in previous years averaged 400 customers, that means some booths served more than 400 and some
                                                          [size=10.000000pt]served fewer than 400.
  
                                                 
•                                                         [size=10.000000pt]Many people prefer other types of food to sandwiches.
  
                                                 
•                                                         [size=10.000000pt]If Adam shares his booth, and the cost of the rental, with a complementary business, he will not have to sell as
                                                          [size=10.000000pt]many sandwiches to break even.
  [size=10.000000pt]答案选的是B
  [size=10.000000pt]
  
  [size=10.000000pt]
  
  [size=10.000000pt]
  
  
  3. Farmers in developing countries claim that the United States government, through farm subsidies, is responsible for the artificially low global price of wheat. Because the U.S. government buys whatever wheat American farmers are unable to sell on the open market, American farmers have no incentive to modulate the size of their crops according to the needs of the global market. As a result, American farmers routinely produce more wheat than the global market can absorb and the global price of wheat is kept low. Without these subsidies, the farmers in developing economies claim, American farmers would produce only the amount of wheat that they could sell on the open market and the global price of wheat would rise. Which of the following, if true, most weakens the claims of the farmers in developing countries regarding the price of wheat?
          •        Wheat that is not processed for consumption is often used for certain industrial applications.
  
          •        Non-governmental buyers of wheat and wheat products are able to predict how much wheat they will need several
  years in advance.
  
          •        The United States government offers similar subsidies to soybean farmers, though the global price of soybeans is
  significantly higher than that of wheat.
  
          •        Other countries, such as Canada and Russia, are likely to produce more wheat if the United States were to reduce
  its output.
  
  
  
          •        The price of sorghum, a crop for which the United States government offers no subsidies, is lower than that of
  wheat.
  答案选的是D
  
                                         

                               
                       
               

OasisTseng

这两题都可以看作方案目的题  
都不属于因果关系题

kzheng304

首先第一题的话，并不是他因削弱。应该是helr中的干扰因素削弱。结论：400*10来break even。（果）前提：4000rent，average 400 customer。（因）400*10=4000. 所以题目出现的一个问题就是认为只要cover了rent就能break even。break even就是revenue=expense。rent是expense中的一种。还有其他的expense。我们削弱就是要找干扰因素这个在笔记中有讲，选项加前提就不一定能得到结论。4000的rent加上其他的杂费超过了赚的钱400*10.所以就选b了。我是这么理解的。来讨论下。我觉的helr的方法挺适合我的，有些人说他方法不好，我倒觉的他的方法才是探讨到了逻辑的本质。用起来估计开始蛮耗时间，但是做多了题目整理多了加入自己的理解也就融汇贯通了。慢慢来吧。