Final answer:
The military-industrial complex refers to the close relationships among government, defense contractors, and the military. It was coined by President Dwight Eisenhower and describes the collusion between these entities to influence government policies and military decisions.
Step-by-step explanation:
The concept that refers to the close relationships among government, defense contractors, and the military is the military-industrial complex. This term was coined by President Dwight Eisenhower to describe the collusion between the representatives of the munitions industry, the military, and elected officials. The military-industrial complex is a network of relationships that benefits from increases in defense spending and can influence government policies and military decisions.