An externality is an indirect effect of an action. It is also known as the spillover effect, given that the cost or benefit of the action effects a third party who did not agree to the initial action. Externalities can be positive or negative. A positive externality happens when a third party reaps the benefit of something they did not cause, such as flood protection provided by a dam. A negative externality happens when a third party bears the cost for a problem they did not cause, such as pollution from a factory that releases toxins into the nearby water system.
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