Respuesta :
An externality is defined as the cost or benefit that affects a group when the group did not choose to receive that cost or benefit. This results in either a position or negative consequence based on what happened to a third party that was not origionally involved.
Someone who wouldn't choose to pay for a certain good or service but who'd get the benefits of it anyway is the best definition given to be the answer to this question.
Answer: The answer to your question is Someone who wouldn't choose to pay for a certain good or service but who'd get the benefits of it anyway