@itzpaquet @Moon The right to private property stems from the right to self-ownership: the right of ownership of your own body, and thus the labor your body can do. The goods you produce with your labor are yours to trade as you will (free market).

Monopolies generally require government intervention to create, and are staples of socialism, wherein that monopoly becomes nationalized. A socialist nation has no need for many competing redundant organizations for making a particular good, so they merge them all into a single monopoly as part of the planned economy. Socialism is full of monopolies for this reason. If you don't like the shitty service of the monopoly, you are pressured to not complain and take the abuse, as it is un-patriotic to complain. For a recent example, see the NHS in the United Kingdom.