The fact that a rock star earns $5 million a year while a teacher earns $25,000 annually is most directly an example of an economy answering the ________ part of one of the two big economic questions. (一个摇滚明星每年赚500万美元的事实,而老师每年赚25000美元,最直接的就是经济回答“两大”之一的经济的一个例子经济问题——中文由在线翻译而来,仅供参考.下同.)