Monopolies and trusts allowed big businesses to control markets, leading to limited competition and consumer choice.
Monopoly: A monopoly occurs when a single company controls a significant portion of the market, giving them the power to set prices and stifle competition. An example is AT&T's monopoly on long-distance telephone services in the US.
Trust: Trusts were large corporations that controlled various aspects of an industry, from raw materials to distribution. Standard Oil Company, controlled by John D. Rockefeller, is a prominent example of a trust.
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