ycknews 發表於 2020-3-19 11:23:53

If a fall in the price of good A increases the quantity demanded of good B,

If a fall in the price of good A increases the quantity demanded of good B,
  A and B are complements
  B is a substitute for A, but A is a complement to B
  A and B are substitutes
  A is a substitute for B, but B is a complement to A


答案:A
A and B are complements
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