Externality takes place when action of one agent exerts direct impact on welfare of other agent, and this impact is not transferred by market prices. When there are externalities in the market, the social marginal cost is not equal to private marginal cost. Positive externalities compel market to produce less than the socially desirable quantity (Gans, King & Mankiw, 2011). Positive externalities are present in the economy when marginal social benefits are greater than marginal private benefits (Cypher, 2014). There are, however, several examples of economic activities that pave the way to production of positive externalities such as:
Provision of Education
Industrial training ...