We found one dictionary that defines the word positive externality:

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1. Positive externality: Wikipedia, the Free Encyclopedia

▸ Words similar to positive externality ▸ Usage examples for positive externality ▸ Idioms related to positive externality ▸ Wikipedia articles (New!) ▸ Words that often appear near positive externality ▸ Rhymes of positive externality ▸ Invented words related to positive externality