请教一个逻辑问题！！！谢谢！！！

devilclare

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[size=14.399999618530273px]Hardin argued that grazing land held in common(that is,open to any user) would always be used less carefully than private grazing lan. Each rancher would be tempted to overuse common land because the benefits would accure to the individual, while the costs of reduced land quality that results from overuse would be spread among all users. But a study comparing 217 million acres of common grazing land with 433 million acres of private grazing land showed that the common land was in better condition.

Which of the following, if true and known by the ranchers, would best help explain the results of the study?

• AWith private grazing land, both the costs and the benefits of overuse fall to the individual user.
• BThe cost in reduced land quality that is attributable to any individual user is less easily measured with common land than it is with private land.
• CAn individual who overuses common grazing land might be able to achieve higher returns than other users can, with the result that he or she would obtain a competitive advantage.
• DIf one user of common land overuses it even slightly, the other users are likely to do so even more, with the consequence that the costs to each user outweigh the benefits.
• EThere are more acres of grazing land held privately than there are held in common.
  

我想问这个study 不是说明common相比于private不是更好吗，那不就是说明private的条件没有common好么。而D选项不是正好反过来了吗，说common不好……

是不是我没读明白题呢？

望大神来解答！！！

liwen0625

你对错答案了，答案明显选D啊。这一题有很多变体，有一个evaluate题型才选C.

ciciwenwen

这题关键是读懂题目 。拿现在的情况比说共用地情况没变差。那么自己和自己比呢？这个才是最重要的。譬如：好汉不提当年勇，虽然现在还是很勇，但是和以前比，那可差多了！。。。