Which of the following is an example of a mixed economy?

A mixed economy is characterized by the coexistence of both private and public enterprise, combining elements of capitalism and socialism. In this system, the government regulates certain industries while allowing for private ownership and individual entrepreneurial efforts in others.

The United States serves as a key example of a mixed economy because it features a predominantly capitalist framework where private individuals and businesses own the means of production and operate for profit. However, the government also intervenes in various ways, such as instituting regulations to protect consumer interests, addressing market failures, and providing public goods and services, including education and infrastructure. This blend of private economic freedom with government intervention to promote social welfare is what defines the mixed economy.

In contrast, North Korea represents a command economy with complete government control over production and distribution. The Paleolithic Age refers to a prehistoric era with no structured economic systems, while Ancient Egypt operated under a more centralized system where the state controlled resources and labor to a significant extent. Thus, these options do not fit the definition of a mixed economy as accurately as the United States does.