单选题 An analyst does research about equilibrium quantity. As the quantity of a product supplied is lower than the equilibrium quantity, which of the following is most likely to increase?
A. Deadweight loss.
B. Producer surplus.
C. Consumer surplus.

【正确答案】 A
【答案解析】[解析] 本题考查的是由过量生产(oveiproduction)和生产不足(underproduction)引起的无谓损失的数量。如果供给量低于均衡量，则价格会低于均衡价格，造成过度需求，此时生产者剩余会减少，而消费者剩余有可能增加，电有可能减少，但是无谓损失(deadweight loss)由于生产不足一定会增加。