Public goods are typically provided by the government, because private markets tend to aproduce less than the socially optimum quantity bproduce them at higher cost ccharge a monopoly price that is greater than the marginal social cost dproduce more than the socially optimum quantity

Public goods are typically provided by the government for several reasons:

a) Produce less than the socially optimum quantity: Public goods are non-excludable and non-rivalrous, meaning they are available to all and one person's use does not diminish another's. Private markets may not produce enough of these goods because they cannot exclude those who do not pay, leading to a free-rider problem.

b) Produce them at higher cost: The government can often provide public goods more efficiently due to economies of scale. For example, it would be inefficient and costly for multiple private companies to build separate road networks.

c) Charge a monopoly price that is greater than the marginal social cost: If a private company were to provide a public good, they could potentially become a monopoly and charge prices that are higher than the social cost of producing the good. This could lead to under-consumption of the good.

d) Produce more than the socially optimum quantity: This is less likely with public goods, as they are typically under-produced in a free market. However, it is possible that a private company could over-produce a public good if they are able to charge a high price for it, leading to inefficiencies.