有价值的资源毫无约束地让公众使用的现象曾否出现过，我历来怀疑，但假设真有其事，租值消散是效果。
I have always been doubtful that there have ever existed valuable resources subjected to unrestrained common exploitation, but assuming this to be true, dissipation of land rent is implied.
奥巴马：我会否觉得美国人民认为因为出现了这些困境我就不应该花点时间和我的女儿们相处？我认为美国人民不会这么想。
Obama: do I think the American people think that because of those hardships I shouldn't spend a little time with my daughters? I don't think that's how the American people think about it.
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