日誌
題目】： If the quantity demanded increase as peoples incomes increase, the resu ...
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【題目】： If the quantity demanded increase as peoples incomes increase, the result of
A： a substitute.
B： a complement.
C： an inferior good.
D： a normal good.
【解答】：D： a normal good.
A： a substitute.
B： a complement.
C： an inferior good.
D： a normal good.
【解答】：D： a normal good.
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