Right or wrong, you are using a poor analogy. The Interstate highway system is a government owned and maintained system funded by our taxes, the telecommunications network, at least 90% anyway, was built by AT&T and funded by investments and customer revenues.
Its not a poor analogy, you just don't understand the economic concepts being discussed. The natural monopoly and the public good have nothing to do with the structure of the organization or enterprise providing it. It has nothing to do with how it was financed. It has to do with the physical production properties of the product or "good" involved. The analogy is very strong. I'm talking about a network of expressways compared to a network of for data bits. Both products are non-rival in consumption, meaning the use of the network (wireless or of expressways) by one person does not prohibit someone else form using it (except in the extreme case when either network is at its peak capacity). To repeat ownership, financing, publicly traded, whether through bond issue or not, whatever: none of these have any impact on the status as a natural monopoly industry.
Even if it did (and it doesn't), the original expressways inn the US started out as private enterprises. They were later nationalized and then became part of the US interstate system. So even if you do look at the corporate structure and financing (even thought it has nothing to do with the topic of the analogy), you'll still find a very similar beginning.
Had the government not stepped in and broke up AT&T, your argument would not exist. While the telecommunications industry, as it stands today, may be considered a natural monopoly, it is only that way because the government stepped in and created this 'false competition.'
No, you're again misunderstanding what a natural monopoly is. Its got nothing to do with what either the government or the monopoly enterprise does. It doesn't even have to involve a monopoly enterprise. Its merely a situation where the marginal and average cost of adding product diminishes. Economies of scale basically does it.
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Telecommunications as an industry is not a natural monopoly, but AT&T is.
An enterprise cannot be a natural monopoly. There could be a monopoly firm producing in a natural monopoly industry. However, there's no question from a mainstream economic perspective: telecommunications is a natural monopoly industry with a public good that is non-rival in consumption. You can try to wiggle your way out of that by saying its all the government's fault, but it just shows you don't understand these concepts. This means trying to infuse competition will not add efficiency. Quite the contrary it will vastly more expensive and vastly less reliable. It will not lead to greater choice, because even with a group of several colluding oligopolists, they will tend to coalesce around a single industry leader and follow the leaders practices.
Again, you're trying to misapply economic theories principle's of laissez faire, laissez passe to an area where they were never meant to apply: i.e., the natural monopoly industry.