Acommand economy tends to exist under a

socialist government that provides a lot of regualtion

Socialist government, is the right answer.

Explanation:

A command economy exists under socialist government basically which provides many regulations. This type of economy arises when the government of the country controls all the essential elements of an economy. Under this type of economy government decides and takes all decisions related to- what to produce, how to produce and whom to produce. Moreover this type of economy often related to political system of communism.