An externality is an event whicha. is external to economics. b. always brings harm to someone in the economy. c. is incidental to some market activity. d. harms the economy as a whole rather than a particular person.

An Externality is an event which is

C: incidental to some market activity.

Incidental to market activity means, that the company or individual may either come across a cost or a profit in response to making a product or service in the market or taking any decisions within its premises.

For example, a company produces something in its factory or plant, so with the result of the production, they may generate the air pollution. That is an external event happening because of them. So they have to make the health and clean up cost on the whole society. This is the externality cost.

Similarly, there are positive externalities. For example if a person gets treated of the contagious disease, others are benefited by his treatment.

b. a single paragraph.

a paragraph is a series of sentences that are organized and make sense, and are all related to a single topic . almost every piece of writing you do that is longer than a few sentences should be organized into paragraphs. this is because paragraphs show a reader where the subdivisions of an essay begin and end, and thus the reader see the organization of the essay into subjects in order to be able to understand its main points.

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