How monopolies can create dificulties for consumers?

How monopolies can create dificulties for consumers?
Monopolies can raise prices on consumers.

Monopolies can essentially only be created by coercion. For example, government can pass a law that says you need to buy insurance from a specific company. Then that company can raise prices.

In a free market the only way to reliably raise prices in the medium to long term is to create a more innovative good or service. Otherwise, if prices are raised consumers will simply go to the competition to get their good or service.