Which type of economic system has government working closely with large privately owned companies?

The type of economic system where the government works closely with large privately owned companies is often referred to as a mixed economy or state capitalism. In this system, the government may regulate or support major industries while allowing private ownership and market forces to operate. This collaboration can aim to promote economic growth, create jobs, and ensure stability, blending elements of both capitalism and socialism. Examples include countries like China, where the state maintains significant influence over the economy while allowing for private enterprise.