There are other requirements on effective monopolies. But the US executive branch has decided not to bother enforcing most of them. Used to be, using monopoly p

There are other requirements on effective monopolies. But the US executive branch has decided not to bother enforcing most of them. Used to be, using monopoly power to drive other companies out of business or out of a market was an abuse of that power. Now all the USDoJ will enforce is charging excessive prices. Reiterating, being a monopoly in the US is not illegal, but it having chosen to have a monopoly makes you subject to extra fairness laws. These laws should be enforced as written, but no recent administration has been willing to step up, and Americans are the poorer for it.