Final answer:
The United States best exhibits the characteristics of a market economy.
Step-by-step explanation:
The United States best exhibits the characteristics of a market economy among the given countries.
A market economy is defined by the free interaction of individuals and businesses in the buying and selling of goods and services, with limited government interference. In the United States, private ownership and entrepreneurship are highly valued, and the majority of economic decisions are made by individuals and businesses based on supply and demand.
On the other hand, China, Cuba, and Sweden have varying degrees of government involvement in their economies, which means they have elements of a command or mixed economy. China and Cuba have historically had more command-oriented economies with significant government control, while Sweden has a mixed economy with a higher degree of government intervention compared to the United States.