In terms of market failure what is a public good?
Answer:
A market failure is a situation where the allocation of goods and resources by the market is not efficient.
A public good is a good that is non-rivalrous (Your use does not effect my use) and non-excludable. Fireworks are a good example.
In practice, problems occur when trying to fund public goods because some crafty people realize that they don't have to pay anything for a public good, but can still use it because its non-excludable. Effiency loss is created because no one can take all the benefits for themselves, and most people won't pay for it if they feel they can get it for free.
This is called the free-rider problem.
Take, for example, Bob and Jim, who both love fireworks equally. If Bob buys fireworks, Jim won't, because he can look at Bobs fireworks for free. Likewise, Jim won't buy fireworks if Bob does.
In this case, neither will buy fireworks, or they will buy significantly less than they would enjoy, because they anticipate free fireworks from the other person.
No, public goods are not only beneficial to everyone but can be used without limit. Roads are actually not an example because there is a limit to how many people can be on the road. A good example is a lighthouse. I am not sure how public goods can cause market failure.
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