Respuesta :
Positive externality - a benefit that is enjoyed by a third-party as a result of an economic transaction. Third-parties include any individual, organisation, property owner, or resource that is indirectly affected.
I believe the answer is: positive externality
Positive externality refers to The benefit that enjoyed by a third party when the first and second party are conducting a transaction.
When you receive a vaccines, you prevent yourself from becoming a host that could contaminate other people from getting the virus. In the example above, you and your children are the first and second party. And other children are the third party.