Externality(redirected from Market externality)
Also found in: Dictionary, Thesaurus.
Related to Market externality: Positive externality
The cost or benefits of a transaction to parties who do not directly participate in it. Externality can be either positive or negative. For example, a merger can lead to higher share prices and bonuses for employees, benefiting shareholders and employees at the two companies merging, This can create wealth and positively impact a community. On the other hand, the merger can drive a competitor out of business, which results in layoffs and reduced wealth, which can hurt a community. Externality is also called spillover or the neighborhood effect. See also: External benefit, External cost.