Question

the citizens of the united states live and work in a closed economy. command economy. mixed market economy. pure market economy.

Explanation:

A closed economy has no international trade, which the US doesn't have. A command economy is government - controlled (like communism), not the US. A pure market economy has no government intervention, but the US has some regulation. The US has a mix of market - driven and government - regulated aspects, so it's a mixed market economy.

Answer:

C. mixed market economy.