Which is not an example of an externality?
The establishment of a new firm in an area increases the general level of wage rates in the area.
2 )
The flowers planted by a householder in his garden give pleasure to his neighbours.
3 )
The immunisation of children against smallpox reduces the danger of the risk of infection to others.
4 )
The installation of security cameras in a city centre results in an increase in thefts elsewhere.
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