Which of the following has a pure market economy?

a. the United States

b. China

c. Great Britain

d. none of the above

From the options above, the closest is the US, but even the US does not have a pure market economy, as some aspects of the economy are regulated by the government: for example education.

Since none of the options have a pure market economy, the correct answer is d: none of the above.

China has a command economy, which means that the government controls even more than in the US (almost everything). UK is more similar to US, but still a lot of its economy is controlled by the government.