Almost every holiday season at least one gift idea achieves fad status. When that happens, prices tend to increase dramatically. Why?
A.The demand curve for fad items is upward-sloping.
B.Quantity demanded exceeds quantity supplied.
C.Too much government regulation in the market.
D.Sellers want to take advantage of people who received a year-end bonus.
正确答案:Quantity demanded exceeds quantity supplied.