What were some solution to Robber barons?

Robber barons examples

Included in the list of so-called robber barons are Henry Ford, Andrew Carnegie, Cornelius Vanderbilt, and John D. Rockefeller. Robber barons were accused of being monopolists who earned profits by intentionally restricting the production of goods and then raising prices.

Explanation:

the installment plan of the 1920s, an arrangement that allowed people to buy what they wanted with a small down payment and pay off the rest in monthly installments, provided americans a way to own what they did not have the money to buy.