现在为您播放多莉·帕顿演唱的《天堂之梯》。
We leave you now with Dolly Parton singing Stairway to Heaven.
帕兰梯和普雷斯科特的理论：一个社会的生产力不仅仅依赖于有用的知识的积累，而且还依赖于这个社会对于生产力加上的约束。
Parente and Prescott's theory: a society's productivity does depend on the set of constraints society imposes as well as the stock of useful knowledge.
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