What is the result of negative externalities in a market?

Efficiencies refer to the optimal allocation of resources where goods and services are produced at the lowest cost and highest value. Negative externalities disrupt efficiency by causing a divergence between private and social costs, ultimately leading to market inefficiencies rather than efficiencies. Therefore, this choice does not align with the consequences of negative externalities.

Subsidies are financial support provided by the government to encourage certain industries or activities. While they can sometimes be used to address negative externalities, they are not a direct result of them. Instead, subsidies may be introduced as a corrective measure, making this answer incorrect in the context of the question.

Underproduction occurs when the quantity of a good produced is less than what is optimal for society. This is not a result of negative externalities; rather, it is often associated with positive externalities, where the benefits to society exceed the private benefits received by producers. Thus, this choice does not correspond with the effects of negative externalities.