Answer:
D
Explanation:
A good has negative externality if the costs to third parties not involved in production is greater than the benefits. an example of an activity that generates negative externality is pollution. Pollution can be generated at little or no cost, so they are usually overproduced. Government can discourage the production of activities that generate negative externality by taxation. Taxation increases the cost of production and therefore discourages overproduction. Tax levied on externality is known as Pigouvian tax.
Government can regulate the amount of externality produced by placing an upper limit on the amount of negative externality permissible
A good has positive externality if the benefits to third parties not involved in production is greater than the cost. an example of an activity that generates positive externality is research and development. Due to the high cost of R & D, they are usually under-produced. Government can encourage the production of activities that generate positive externality by granting subsidies.
A public good is a good that is non excludable and non rivalrous. An example of a public good is a statue in a public park Everyone has assess to the statue and because one person is enjoying the view of the statue does not means another person cannot enjoy the view of the statue
