what business practices contributed most to andrew carnegies ability to form a monopoly?\no combining his…

what business practices contributed most to andrew carnegies ability to form a monopoly?\no combining his companies into one company and controlling all aspect of steel production\no focusing on a single aspect of steel production\no using profits to support charities and greatly improving his reputation\no increasing his profits every year
Answer
Brief Explanations:
Andrew Carnegie formed a monopoly by vertical - integration. Combining his companies into one and controlling all aspects of steel production (mining iron ore, coal, transportation, etc.) gave him significant market power. Focusing on a single aspect wouldn't lead to a monopoly. Using profits for charity and increasing profits don't directly contribute to forming a monopoly.
Answer:
combining his companies into one company and controlling all aspect of steel production