Why is the U.S. economy called a mixed market economy?

 A mixed economy is variously defined as an economic system blending elements of market economies with elements of planned economies, free markets with state interventionism, or private enterprise with public enterprise. As such, there is no single definition of a mixed economy. One definition is about a mixture of markets with state interventionism, referring specifically to capitalist market economies with strong regulatory oversight and extensive interventions into markets. The other definition is apolitical in nature, strictly referring to an economy containing a mixture of private enterprise with public enterprise  

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