James grows fruit trees in his garden. They attract butterflies and bees.
What is not an externality of this situation?
1 )
Neighbours may be stung by the bees that pollinate the trees.
Neighbours may buy fruit more cheaply from James than from the local supermarket.
3 )
Neighbours may enjoy better air quality as the trees naturally improve the atmosphere.
4 )
Neighbours may like to watch the activity of the wildlife at no cost.
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