externalities - Master This Word
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externalities Word Meanings
- A consequence of an activity that affects other parties without being reflected in costs.
- Uncompensated side effects of an economic activity.
- An impact on someone or something not involved in the transaction.
externalities Example Sentences
Example sentences are the start of understanding. Don't rush to memorize. First feel how the word works in a sentence.
- An externality can affect many people.
- Pollution is a negative externality.
- A good idea can create a positive externality.
- Externalities can change how we make choices.
- We should think about externalities in our decisions.
externalities Phonetic & Pronunciation
UK
/ɛkstəˈnælɪti/
US
/ɛkstərˈnæləti/
externalities Word Etymology
Root decomposition: external (outside) + -ity (quality of). Historical origin: Latin 'externus' → Old French 'external' → English. Memory image: Imagine a factory that makes toys, but the pollution it generates affects the people living nearby—those are the externalities of its production.
Note 1: These definitions and etymologies are not standard dictionary definitions, but extended explanations provided to help with memorization and understanding of the actual application of words. Through this background information, we strive to make words more vivid and easier to understand, and help you remember their meanings in real life.
Note 2: LexiTalk designs the learning flow around the linguistics principle of “Comprehensible Input.” When learners encounter material that is slightly above their level but still understandable from context, the brain naturally absorbs the language. That’s why we keep every word inside authentic contexts, using examples and associations to help you understand it and use it flexibly.
Read the FAQ explanation of Comprehensible InputReal Context
An externality is a consequence of an economic activity that affects people who are not directly involved in the activity, and it is not reflected in market prices. Positive externalities occur when third parties gain a benefit from someone’s action, such as a well‑maintained garden boosting nearby property values. Negative externalities are costs imposed on others, like a factory’s pollution harming local residents. Because markets typically ignore externalities, production or consumption can be higher or lower than what would be socially optimal. Public policy often tries to internalize these spillover effects through taxes, subsidies, or regulations to align private incentives with social welfare.
Usage Reminders
- Identify who bears costs
- Note if the effect is external to the transaction
- Distinguish positive vs negative externalities
- Remember externalities are not priced in markets
- Consider policy tools that internalize spillovers
Common Misconceptions
- Externalities are the same as market prices
- Only negative effects are externalities
- Externalities only involve pollution
- Externalities are always intentional
- If everyone pays for something, there is no externality
Thinking Differences
English speakers often frame externalities as spillover costs or benefits that lie outside a market price; learners should avoid equating externalities with public goods and focus on effects accruing to nonparticipants.
Learning Tips
- Link externalities to real-world cases you know
- Practice distinguishing positive vs negative externalities
- Use 'internalize' in policy contexts
- Learn common collocations: externalities arise, externalities affect
- Read policy articles to see formal language
- Create your own sentences about local projects
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