Whether studying the output of the U.S. economy or how many classes a student will take, an unifying concept is that:
A.wants are unlimited and resources are scarce, so trade-offs have to be made.
B.both wants and resources are unlimited.
C.wants are limited and resources are unlimited, so trade-offs have to be made.
D.wants are limited and resources are unlimited, so trade-offs are unnecessary.
正确答案:wants are unlimited and resources are scarce, so trade-offs have to be made.
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