externality
C1-C2Formal, Academic, Technical (Economics, Business, Policy)
Definition
Meaning
A consequence of an economic activity that affects third parties not directly involved in the transaction, without being reflected in market prices.
Any side effect, impact, or cost/benefit that falls on others outside of a decision-making process, often unintended or overlooked. In broader usage, it can refer to the state or quality of being external.
Linguistics
Semantic Notes
The term is most often used in a negative sense (e.g., pollution is a negative externality), but positive externalities also exist (e.g., a well-kept garden benefitting neighbours). It fundamentally concerns a failure to internalise all costs and benefits.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. The term is used identically in economics and policy discourse in both regions.
Connotations
Neutral/technical in both varieties. It carries a slightly bureaucratic or academic tone.
Frequency
Slightly more frequent in American English due to the larger volume of economic and policy literature, but the term is standard in UK academic and professional contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
[verb] an externality (e.g., create, address, internalise)[adjective] externality (e.g., negative, positive)externality of [noun] (e.g., externality of production)externality on [noun] (e.g., externality on society)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[Not idiom-rich; technical term]”
Usage
Context Usage
Business
Discussions on corporate social responsibility, where a factory's pollution is a negative externality imposed on the local community.
Academic
Central concept in welfare economics for analysing market failure and the justification for government intervention (e.g., Pigouvian taxes).
Everyday
Rarely used. Might appear in simplified news articles about policy (e.g., 'The carbon tax aims to make companies pay for the externality of climate change').
Technical
Precise modelling of costs/benefits in economics, engineering, and environmental science.
Examples
By Part of Speech
verb
British English
- The process aims to externalise certain costs onto the public.
- Firms should not be allowed to externalise their waste disposal problems.
American English
- Companies often externalize healthcare costs.
- The policy seeks to prevent corporations from externalizing environmental damage.
adverb
British English
- The cost was borne externally by the community.
- The benefits accrued externally to the firm's shareholders.
American English
- The damage was felt externally to the market transaction.
- The value generated flowed externally to other businesses.
adjective
British English
- The external effects were not considered in the initial proposal.
- They conducted an analysis of external costs.
American English
- The external impacts were significant.
- We need to account for external factors in our model.
Examples
By CEFR Level
- Loud music from a party is a negative externality for neighbours.
- A beautiful garden can be a positive externality for people walking by.
- Governments sometimes tax products like cigarettes to account for the negative externalities of healthcare costs.
- The new park created a positive externality by increasing nearby property values.
- Economists argue that carbon pricing is essential to internalise the massive negative externality of greenhouse gas emissions.
- The software developer's work generated significant positive externalities through an open-source ecosystem that benefited the entire industry.
Learning
Memory Aids
Mnemonic
Think EXTERNAL + REALITY. An externality is an EXTERNAL cost or benefit that becomes a REALITY for someone not involved in the original deal.
Conceptual Metaphor
ECONOMIC ACTIVITY IS A CONTAINER (with costs/benefits spilling over the sides onto others).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating as 'внешность' (appearance) or 'внешний вид'. The correct economic term is 'экстерналия', but more common translations are 'внешний эффект' or 'побочный эффект'.
Common Mistakes
- Using it as a synonym for any generic 'external factor'. An externality specifically results from an economic transaction/activity. Incorrect: 'The rainy weather was an externality we couldn't control.' Correct: 'The noise from the new airport is a negative externality for nearby residents.'
Practice
Quiz
What is the primary purpose of a 'Pigouvian tax' in economics?
FAQ
Frequently Asked Questions
Yes, but it is an extension of the economic concept. It is correctly used to describe any significant side effect or impact (positive or negative) on third parties from any decision or activity, especially in policy, business, or environmental discussions.
A 'side effect' is a broader, more general term for an unintended consequence. An 'externality' is a specific type of side effect in economics where the cost or benefit is not borne by the parties involved in the transaction, leading to market inefficiency.
No. Externalities can be negative (e.g., pollution, noise) or positive (e.g., vaccination creating herd immunity, research and development sparking innovation elsewhere). The term is neutral; the 'positive' or 'negative' descriptor is crucial.
It means adjusting the market price or process so that the party responsible for creating the externality bears its full cost or reaps its full benefit. For example, a carbon tax forces polluters to pay for the climate damage they cause, thereby 'internalising' that cost into their decision-making.