Monopolies can have a negative impact on the economy in a variety of ways.
Monopolies are bad for the economy and society because they can lead to higher prices for consumers, lower quality products, fewer choices for consumers, and less investment from other companies.
Consumers who purchase monopolized goods pay more than they would otherwise pay in a competitive market. This is because firms with monopoly power have no incentive to pass on any savings that may result from a decrease in costs (e.g., if a commodity becomes cheaper). Without competition driving down prices, the consumer loses out financially while still receiving the same product or service at its higher price point.
Additionally, monopolies tend not only to be able to raise their prices without fear of losing customers but also reduce quality while increasing quantity—and often do both simultaneously! Not only does this hurt consumers’ wallets; it also hurts society by giving you substandard products and services that will wear out sooner than necessary (and require replacement) as well as being inferior in terms of aesthetics or functionality compared with alternatives available elsewhere on the market today!
The U.S. government allows monopolies to exist because they provide a service that is essential for the economy. For example, if a company provides electricity to homes and businesses, it would be difficult for competitors to compete with that company because there wouldn't be enough people buying electricity from another source.
Another reason why monopolies are sometimes allowed to exist is that it's difficult for governments to break them up into smaller companies or take away their power over industry. If you were trying to break up a big corporation like Microsoft or Google into smaller pieces, who would own the patents? How would you know how much each piece was worth? These questions make it hard for governments around the world (and especially here in the United States) when decide whether or not they should step in and stop this type of behavior by companies who have been deemed too large by society at large.