Final answer:
When negative externalities exist, the market outcome is not efficient from society's point of view. Private markets tend to produce too much of products that create negative externalities.
Step-by-step explanation:
When negative externalities exist, the market outcome is not efficient from society's point of view. Private markets tend to produce too much of products that create negative externalities.
A negative externality occurs when the production or consumption of a good imposes costs on third parties. For example, pollution from a factory negatively affects the health and well-being of nearby residents.
In the case of negative externalities, the market equilibrium does not take into account the costs imposed on society. As a result, private markets tend to overproduce goods that create negative externalities, leading to an inefficient allocation of resources.