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题库 / Prep2007E2-CR-15
Some airlines allegedly reduce fares on certain routes to a level at which they lose money, in order to drive competitors off those routes. However, this method of eliminating competition cannot be profitable in the long run. Once an airline successfully implements this method, any attempt to recoup the earlier losses by charging high fares on that route for an extended period would only provide competitors with a better opportunity to undercut the airline's fares.
Which of the following, if true, most seriously weakens the argument?
In some countries it is not illegal for a company to drive away competitors by selling a product below cost.
Airline executives generally believe that a company that once underpriced its fares to drive away competitors is very likely to do so again if new competitors emerge.
As part of promotions designed to attract new customers, airlines sometimes reduce their ticket prices to below an economically sustainable level.
On deciding to stop serving particular routes, most airlines shift resources to other routes rather than reduce the size of their operations.
When airlines dramatically reduce their fares on a particular route, the total number of air passengers on that route increases greatly.
当时选了D，想着competitor都退出了，应该不会回来了，D项不正是更加说明competitors回来可能性几乎没有嘛，于是乎选了D。
但回过头来想想，D说“most airlines shift resources to other routes rather than reduce the size of their operations. ”这只能说明竞争者们退出后，在既定条件不变的情况下，competitors 回来可能性减小（也就是说如果我们航空公司继续维持低价来吸引顾客，competitors无利可图时，他们一般不会回来），但是但是但是！问题的关键是我们的收费提高后，可想而知获利增加，这时虽然其他competitors回归的成本比初始状态时要高，可仍然有利可图，所以可能会继续回来，而正确选项B正好排除了这个可能，说只要你一回来，我就又降价，看你敢不敢回来！
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