蒂布特理论证明社区能够更有效的提供区域公共品。
The “Tiebout theory” shows that local public goods will tend to be efficiently provided.
提供路线导航的网站很多，有的提供区域公共交通路线规划服务，有的提供铁路交通服务，有的提供城市级轻轨、公交和渡船服务。
There are sites devoted to regional public transportation route planning, sites devoted to rail transportation, and city-wide sites for light rail, bus and ferry planning.
然而，如果能给被捕食的动物提供一些它们在野外时那样的安全区域，它们的数量会降到很低但不灭绝。
However, if safe areas like those prey animals have in the wild are provided, the prey population drops to low level but not extinction.
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