Public goods are distinguished by two features : 1 From a public good can be no one excluded . 2. For public goods, there is no rivalry in consumption , as these not be consumed more by increased consumption, or not divisible into parts.
Typical examples of public goods:
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Lighthouse: 1 By the light of the lighthouse can not ship orientation seeks to exclude. 2. The light from the lighthouse does not become less, that it is used by several vessels for orientation.
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Other examples: the national defense, clean air, the political referendum, etc.
border examples which meet only one allele are:
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common pool: Common pool resources such as a meadow that is part of a community and to everyone's use is available (eg there to graze cows). This is only the first feature that no one (who belongs to this community) can be excluded, met. The rivalry in consumption is that no unlimited number of cows can graze on the lawn at a time, or that the lawn will be once grazed.
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Clubgut: eg fine art at the Art Museum. Here is just the second feature, no rivalry in consumption met (under the condition that the premises are large enough) because the consideration by additional visitors to the work of art changed. By contrast, the first criterion, that no one can be excluded, hurt by the fees, and the screening function of the premises.
private goods to attend the any of the two features:
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an apple, one's own computer, the rented apartment, the place in the summer academy, etc.
problem of free-riding:
is the case of public goods, the problem is that they provide the individual any incentive to seek to say this spending costs, because the benefits can be enjoyed when even nothing is contributed. Or else too: If all the others think and I contribute the only person my costs, my contribution will be useless because it is not to achieve the objective is sufficient.
Public goods thus have no market opportunities and must otherwise be introduced and regulated (which also results in the policy, the problem is that for each Politicians with limited speaking time little incentive to devote to these issues a priority).
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