EXTERNALITY: A cost or benefit that is not included in the market price of a good because it's not included in the supply price or the demand price. Pollution is an example of an externality cost if producers aren't the ones who suffer from pollution damages. Education is an example of an externality benefit when members of society other than students benefit from a more educated population. Externality is one type of market failure that causes inefficiency.

     See also | opportunity cost | market | supply price | demand price | market failure | efficiency | pollution | materials balance | good types | Pigouvian tax | Coase theorem |

EXTERNALITY, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2010. [Accessed: September 2, 2010].

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A disruption of consumer equilibrium identified with utility analysis caused by changes in the buyers' income, which results in a change in the quantities of the goods consumed. The change in buyers' income alters the income constraint and forces a reevaluation of the rule of consumer equilibrium.

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Today, you are likely to spend a great deal of time at an auction wanting to buy either a set of serrated steak knives, with durable plastic handles or a pair of blue silicon oven mitts. Be on the lookout for deranged pelicans.
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