Another trap we often fall to Is that we are not really sure what things are worth. And so we use clues(暗示) to tell us what we ought to pay for them. US economist Dan Ariely has done an experiment to prove this. According to the Atlantic, Ariely pretended he was giving a lecture on poetry. He told one group of students that the tickets cost money and another group that they would be paid to attend. Then he informed both groups that thelecture was free. The first group was anxious to attend, believing they were getting something of value for free. The second group mostly declined, believing they were being forced to volunteer for the same event without reward.

What's a lecture on poetry by an economist worth? The students bad no idea. That's

the point. Do we really know what a shirt is worth ? What about a cup of coffee? What's the worth of a life insurance.policy? Who knows? Most of us don't. As a result, our shopping

brain uses only what is knowable:

visual(祝觉的) clues, invited emotions, comparisons, and

a sense of bargain. We are not stupid. We are just easily influenced.

10. The first paragraph of the passage is intended to

A. ask a question

B. introduce a topic

C. give some examples

D. describe a phenomenon

11. The writer takes the math for example in Paragraph 2 to show

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