5 包子的市場需求函數為：QD=200–3P+3PM，其中 QD為包子的需求量，P 為包子的市場價格，PM為饅頭的市場價格。由此需求函數我們可以看出：(A)包子和饅頭的市場需求互不相關(B)包子和饅頭

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5 包子的市場需求函數為：QD=200–3P+3PM，其中 QD為包子的需求量，P 為包子的市場價格，PM為饅頭的市場價格。由此需求函數我們可以看出：
(A)包子和饅頭的市場需求互不相關
(B)包子和饅頭為互補品
(C)包子和饅頭為替代品
(D)資訊不足、無法判定

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