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feifei逻辑-29 题目第一句话是什么意思啊?

29. The price of a full-fare coach ticket from Toronto to Dallas
on Breezeway Airlines is the same today as it was a year ago, if inflation is taken into account by calculating prices in constant dollars. However, today 90 percent of the Toronto-to-Dallas coach tickets that Breezeway sells are discount tickets and only 10 percent are full-fare tickets, whereas a year ago half were discount tickets and half were full-fare tickets. Therefore, on average, people pay less today in constant dollars for a Breezeway Toronto-to-Dallas coach ticket than they did a year ago.


Which one of the following, if assumed, would allow the conclusion above to be properly drawn?



(A) A Toronto-to-Dallas full-fare coach ticket on Breezeway Airlines provides ticket-holders with a lower level of service today than such a ticket provided a year ago.

(B) A Toronto-to-Dallas discount coach ticket on Breezeway Airlines costs about the same in constant dollars as they did a year ago.

(C) All full-fare coach tickets on Breezeway Airlines cost the same in constant dollars as they did a year ago.

(D) The average number of coach passengers per flight that Breezeway Airlines carries from Toronto to Dallas
today is higher than the average number per flight a year ago.
(E) The criteria that Breezeway Airlines uses for permitting passengers to buy discount coach tickets on the Toronto-to-Dallas route are different today than they were a year ago.

答案是B。不理解的是,题目里第一句话说,今年的价格和去年的价格考虑了通货膨胀以后是一样的,那么就是说实际上的数额是不一样的吗?然后后面又一直说constant price什么的,然后我就晕了。。。。。求助啊~~~~麻烦帮我理下思路,谢谢~~~~~
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原来如此,我懂了。感谢楼上MM!!!

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正想发个帖子问这题呢.1楼解释的很清楚。想再追问一下,constant dollars 到底是什么概念?我只能理解表面的 ...
vespertine612 发表于 2011-9-26 06:30



constant dollars是和current dollars相对应的,要考虑到cpi的因素
比如说1990年的10元钱和2009年的10元钱的购买力是不一样的,1990年current dollars是10元,而2009年的current dollars是10元,但是相对于1990年,2009年的constant dollars就可能是1元了

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正想发个帖子问这题呢.1楼解释的很清楚。想再追问一下,constant dollars 到底是什么概念?我只能理解表面的字义,但体会不了他到底起什么作用?请XDJM解答。多谢。

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讲得好清楚啊~~~太感谢了~~~

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今年=90%(打折1)+10%(全价1)
去年=50%(打折2)+50%(全价2)
因为人们PAY得更少,所以
今年<去年
因为人们是用CD付得,因此全价1=全价2(第一句话得来)
式子就变成了
90%(折1)<50%(折2)+40(全2)

加入B,在CD情况下折1=折2,那么
40%(折2)<40(全2),全价肯定高于打折得嘛,正确

还有就是,我把这类题称为双因素题,就是有两个因素

比如文中说得全价和打折,即然文中很明确告诉了全价关系,那么答案很可能锁定在打折关系上

类似的还有供给+需求,收入+物价

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