The parents the Council is now going to contact are those__________

A．who had not yet answered letters

B．who didn't want to pay

C．whose children stayed away from school

D．who had asked about transport before

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参考答案

根据最后一段最后一句“parents who in the past had asked if transport could be pl"Ovided for their children”可知答案为D。

1 “搭便车”现象是对下列( )的一种形象的比喻。

A．社会福利问题

B．市场失灵问题

C．公共物品问题

D．以上都是

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2
社会福利不可能再得到增进的一种状态是( )。

A．帕累托改进

B．帕累托最优

C．局部均衡

D．市场效率

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3
如果商品X对于商品Y的边际替代率MRSxy小于X和Y的价格之比Px／Py，则( )。

A．该消费者应减少X消费，增加Y消费

B．该消费者应增加X消费，减少Y消费

C．单位货币购买X带来的边际效用大于单位货币购买Y带来的边际效用

D．该消费者获得了最大效用

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