Public corporations are government-owned enterprises established by law to provide goods or services that are essential to the public welfare. Unlike private enterprises, whose primary objective is to maximise profit for their owners and shareholders, public corporations exist to provide essential services such as electricity, water supply, postal services, public transportation, and telecommunications.
These services are often natural monopolies or goods with significant social benefits that private enterprises may under-provide because they are not sufficiently profitable, especially in remote or underserved areas. Public corporations are expected to serve the public interest, extend coverage to all citizens, and may operate at a loss or with subsidised pricing to ensure accessibility.
The other options do not accurately describe the distinguishing feature of public corporations. While public corporations may sometimes curtail competition in their sectors, this is not their defining purpose. Making profit is the goal of private enterprises, not public corporations. Preventing private investors is not their aim either; in many countries, public corporations coexist with private-sector competitors or are eventually privatised.