If your neighbors remove the weeds in their yard and this activity prevents weed seeds from blowing into your yard,the benefit you receive is a public good.
If your neighbors remove the weeds in their yard and this activity prevents weed seeds from blowing into your yard,the benefit you receive is an externality.

Question

Quizplus · Accepted Answer

The benefit you receive is an externality, not a public good. An externality is a side effect or consequence of an activity that affects other parties without being reflected in the cost of the goods or services involved. A public good is non-excludable and non-rivalrous, which is not the case here.

If Your Neighbors Remove the Weeds in Their Yard and This