Since the value of a degree from a selective institution depends on its scarcity, good universities have little incentive to produce more graduates.
既然一所精挑细选的院校的学位价值在于它的稀缺性，那么优秀的大学也就没有多少动力来培养更多的毕业生了。
Chapter 3 summarizes incentive systems and return mechanisms on a selective basis according to the research demands.
第3章根据研究的需要对激励理论及报酬理论作了选择性的综述。
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