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【单选题】
The market is consist of 4 groups of consumers, each group has 1000 consumers. Each consumer purchases at most 1 unit of product. The maximum willingness to pay (WTP) of consumers in these four groups are $10, $8, $5, and $3, respectively. In this market, there are two firms, charging price at pA=$6 and pB=$4, respectively. Each firm has a supply capacity of 1000 units. If consumers are efficient rationing, who purchases from which firm?A.
Consumers with WTP=$10 and $8 purchase from firm A at $6, those with WTP=$5 purchase from firm B at $4, and the rest purchases nothing.
B.
Consumers with WTP=$10, $8, and $5 purchase from firm B at $4, and the rest purchases nothing.
C.
Consumers with WTP=$10 purchase from firm B at $4; those with WTP=$8 purchase from firm A at $6, and the rest purchases nothing.
D.
Consumers with WTP=$10 purchase from firm B at $4; those with WTP=$8 and $5 purchase from firm A at $6, and the rest purchases nothing.
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