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Definition

Definition of External Effect (Externality)

An external effect, also known as an externality, occurs when an individual's action imposes a cost or confers a benefit on others, and this impact is not factored into the individual's decision. For example, pollution from a banana plantation is considered an external effect because it harms local fishermen, who are not part of the decision-making process, while the pollution itself has no direct consequence for the plantation owners who decide on pesticide use.

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Updated 2026-05-02

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