请教GWD-5-31。讨论帖有限，故再研究一下

Q31:

Studies in restaurants show that the tips left by customers who pay their bill in cash tend to be larger when the bill is presented on a tray that bears a credit-card logo.  Consumer psychologists hypothesize that simply seeing a credit-card logo makes many credit-card holders willing to spend more because it reminds them that their spending power exceeds the cash they have immediately available.

Which of the following, if true, most strongly supports the psychologists’ interpretation of the studies?

1. The effect noted in the studies is not limited to patrons who have credit cards.
2. Patrons who are under financial pressure from their credit-card obligations tend to tip less when presented with a restaurant bill on a tray with credit-card logo than when the tray has no logo.
3. In virtually all of the cases in the studies, the patrons who paid bills in cash did not possess credit cards.
4. In general, restaurant patrons who pay their bills in cash leave larger tips than do those who pay by credit card.
5. The percentage of restaurant bills paid with given brand of credit card increases when that credit card’s logo is displayed on the tray with which the bill is prepared.

答案是B.

但我认为是E. 请问E何错之有？

my two cents: E说的某一个牌子的卡show得越多，这个卡就用得越多，和LOR没有关系。这道题LOR是这样：有logo的给tips多（结果） -〉logo刺激了消费欲望。（原因） AC挺明显是削弱的。

可是我有个关于B的疑问：B说顾客看到了logo,由于有obligation，会付更少的tips.原文说信用卡诱使消费因为不用考虑cash，可是B说因为有另一个原因使得顾客考虑到经济因素，这个不是他因削弱么。。。

Consumer psychologists 认为在帐单上出现信用卡的标志，顾客付小费的数量就增加，因为顾客会想：虽然我现在没有很多现金，但是可以刷卡阿，又不用马上还，所以多给点无所谓。B中举了一个相反的情况：当那些 under financial pressure 的顾客本来想多给点的，看到logo意识到自己的不能多花钱，因为有很多账单未付！加强了logo对tip的影响！我觉得E的问题在于把这件事的范围缩小了，它提到given brand of credit card ，那是不是出现不given brand of credit card 的logo就没有影响了？-----不知道！因此，E不能加强文中普遍情况的结论！个人拙见，如有不妥，请能人指教！

E在说信用卡使用的logo多，使用信用卡消费的比例多

无关

第一句话是现象.

后面的话是结论.

就是说研究发现在餐厅吃饭的人们使用信用卡买单而给的消费比使用现金买单的多.

我觉的B是对的, 这题的结论是假设是看见信用卡的LOGO能够对人们伏小费起多影响. B很好的坚强了这个假设.

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