The side effect on an individual or entity due to the actions of another individual or entity. For example, the production of energy in a nuclear power plant benefits the owners of the power plant, but creates externalities in the form of radioactive waste for the environment and its inhabitants.
Related information about externality:
- Externality - Wikipedia, the free encyclopedia
 In economics, an externality, or transaction spillover, is a cost or benefit that is not   transmitted through prices or is incurred by a party who was not involved as ...
 
- Externality - Dictionary Definition of Externality
 Definition: An externality is an effect of a purchase or use decision by one set of   parties on others who did not have a choice and whose interests were not taken ...
 
- Externality Definition | Investopedia
 A consequence of an economic activity that is experienced by unrelated third   parties. An externality can be either positive or negative.
 
- Externality
 Economics studies two forms of externalities. An externality is something that,   while it does not monetarily affect the producer of a good, does influence the ...
 
- Externality: A Glossary of Political Economy Terms - Dr. Paul M ...
 Externality. A situation in which the private costs or benefits to the producers or   purchasers of a good or service differs from the total social costs or benefits ...
 
- Externality - Merriam-Webster Online
 the quality or state of being external or externalized. 2. : something that is   external. 3. : a secondary or unintended consequence <pollution and other ...
 
- Externality | Define Externality at Dictionary.com
 noun, plural ex·ter·nal·i·ties. 1. the state or quality of being external. 2. something   external; an outward feature. 3. excessive attention to externals. 4. an external ...
 
- Externality - JStor
 Externality has been, and is, central to the neo-classical critique of ... In this paper  , we propose to clarify the notion of externality by defining it rigorously and ...