单项选择题

According to the passage people tend to buy more when ______.

A．prices are expected to go up
B．prices are expected to go down
C．prices don't change
D．business policy remains unchanged
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单项选择题
The best title of the passage is ______.
A．Consumer's Purchasing Power
B．Relationship between Income and Purchasing Power
C．Traditional Assumptions
D．Studies in Consumer Behavior
单项选择题
According to the passage, what does the author think of the traditional assumptions about consumer behavior
A．The assumptions are not always true.
B．They are in reliable.
C．They are in consistent with the findings in investigation.
D．The assumptions are not at all wrong.
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