What is the result of negative externalities in a market?

Underproduction would imply that the market is producing fewer goods than what would be socially optimal. This is contrary to the impact of negative externalities, which typically incentivize producers to increase output, ignoring the societal costs associated with their production processes.

Efficiencies refer to an optimal allocation of resources where goods are produced at the lowest possible cost and in the right quantities. Negative externalities create inefficiencies in the market, as they distort the true cost of production and lead to overproduction rather than achieving an efficient outcome.

Subsidies are financial support provided by the government to encourage production or consumption of certain goods. While they can be used to address negative externalities, they are not a direct result of such externalities. Instead, they may be a policy response to mitigate the overproduction caused by negative externalities.