How did carnegie build his monopoly? check all of the boxes that apply. he cut costs to drive down steel prices, forcing competitors out of business. he bought competitors who had created new innovations in the industry. he purchased refineries across the country to control the nation’s oil production.

Carnegie build his monopoly by cutting costs to drive down steel prices, forcing competitors out of business.

Option A

Explanation:

Carnegie made monopoly in the economy of the United States in the field of iron and steel industry. He made monopoly by cutting down the costs and prices of the steel manufactured by him.

He almost owned everything which was required to make steel as a result of which he could cut down the prices. More over he also tried to reduce the inefficiencies in that factory and provided efficient work place to his employees. This also resulted in increasing the productivity of iron and steel.

food chain i would say only because there is competition on getting food and survival

the exclusive possession or control of the supply or trade in a commodity or service.