Respuesta :
Externality An economic side effect of a good or service that generates benefits or costs to someone other than the person deciding how much to produce or consume. When the production or consumption of a good or service has an effect upon a third party. Failure of the market to achieve a social optimum where MSB = MSC
The answer is a)produce or consume
Its gotta be A. don't know why the top answer is rated 1 star tho?