The citizens of the United States live and work in a a) closed economy. b) command economy. c) mixed market economy. d) pure market economy.

Step 1: Define the Problem

Identify the type of economy in which the citizens of the United States live and work.

Step 2: Break Down the Problem

Understand the characteristics of each type of economy:

• Closed Economy: An economy that does not interact with other economies in the world.
• Command Economy: An economy where the government makes all decisions regarding production and distribution.
• Mixed Market Economy: An economy that features both private enterprise and government intervention.
• Pure Market Economy: An economy driven entirely by market forces without government intervention.

Step 3: Apply Relevant Concepts

Evaluate the economic structure of the United States:

• The U.S. has elements of both private enterprise and government regulation.
• There is significant government involvement in economic activities, such as regulations, subsidies, and social welfare programs.

Step 4: Analysis, Verify and Summarize

Analyze the characteristics of the U.S. economy:

• The U.S. economy is not closed, as it engages in international trade.
• It is not a command economy, as private businesses operate freely.
• It is not a pure market economy, due to government regulations and interventions.
• The U.S. economy is best described as a mixed market economy.

Final Answer

c) mixed market economy.