但是它们同样也有“减少性质”（或者说“有竞争性”），像是私有财产：如果一个人使用了它们，那么别人使用的机会就少了。
But they are also “subtractable” (or “rivalrous”), like private property: if one person uses them, another’s access is diminished.
在“美国梦”的追求中，私有财产被看作通向个人自由的通行证。
" In the pursuit of "American dream" , private property is regarded as the permit to the personal freedom.
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