In two or three sentences, describe how antitrust laws encourages competition

Antitrust laws prevent monopolies.

A monopoly is a company or business that dominates a particular market to such an extent that there is no viable competition to that company.

Since a monopoly does not have any other serious competition in a market, the monopoly is at greater liberty to charge higher prices and offer lower-quality prices.

Antitrust laws break up or limit the size of monopolies, allowing other companies to enter a market.