Legally protected monopolies are intended to avoid the latter state, especially where interruptions of service could have ripple effects on other industries.
I believe the legislative goal was never about costs or overbuilt infrastructure, but to ensure that at least one provider was always available. So they chose to mandate that there could never be more than one. For the sake of having a dial tone 99.99% of the time, they made the choice for everyone that phone service would cost more, for everyone, every day, forever.
Talking about "natural monopoly" is just a distraction. The de jure monopoly is about the difference between "no choice" and "zero choices". You may have made the same choice on a smaller scale when designing code that expects exactly one input instead of zero to N inputs. An alternate solution would be to operate a state-owned, not-for-profit utility, as the supplier of last resort, but that has its own problems, which may be more or less difficult than the monopoly problems, depending on specific circumstances.
Von Mises is a good economics resource for libertarian-leaning folks, but you can't trust any single macro-economist to get everything right. I'm actually not sure any single one of them is more than 50% correct, or even if their amount of correctness is stable over time. Markets have this annoying habit of integrating all information, whether true or false, and reacting to it. This includes everything that all economists in all schools have ever written. It truly is a dismal science.
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