Final answer:
The government plays a role in protecting the public from market failure through regulation and provision of public goods, as well as reducing negative externalities.
Step-by-step explanation:
The subject of this question is Social Studies at a High School level.
The government plays a role in protecting the public from market failure by regulating inefficiencies, preventing monopolies, providing public goods, and reducing negative externalities. For example, the government may impose regulations on companies to prevent them from having too much control over a market and to ensure that public goods like infrastructure are provided. Furthermore, the government may intervene to reduce negative externalities by requiring companies to implement pollution-reduction technology or pay fines.