Who benefited from big businesses and monopolies during the glided age?

Andrew Carnegie

Explanation:

Given that the Gilded Age was known to be the period of the economic upturn in the United States and the whole of America at large around the 1870s to 1900s. This period was characterized by the development of infrastructures such as the railway. These massive infrastructures were heavily dependent on iron and steel in their construction.

However, the main company that focused on iron and steel company was owned by Andrew Carnegie at the time. And he, therefore, benefited from big businesses and monopolies during the glided age.

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