What is externality? A. a side effect of a good service generating benefits or costs to someone who doesn't decide how much to produce or consume B. someone who would choose to pay for a certain good or service but does not get the benefits of it if provided as a public good C. someone who wouldn't choose to pay for a certain good or service but who'd get the benefits of it anyway if provided as a public good D. a shared good or service for which it would be impractical to make consumers pay in
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