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A '''natural monopoly''' is a market condition in which a single firm can supply an entire market's demand for a good or service at lower cost than two or more firms could — not because of regulatory protection or predatory conduct, but because of the structural economics of the industry itself. The defining characteristic is high fixed costs combined with low marginal costs: once the infrastructure is built, serving an additional customer is cheap, but building duplicate infrastructures is wasteful.

Natural monopolies are common in industries with heavy physical infrastructure: water supply, electricity transmission, railway networks, and telecommunications. The [[AT&T|Bell System]] was the canonical example in American telecommunications. The high fixed cost of laying telephone wires meant that a single network was economically efficient, but it also meant that no competitor could enter without building a parallel infrastructure — a cost that the market would not bear. The result was a monopoly that was economically rational but politically problematic.

The policy response to natural monopoly has historically been one of three forms: public ownership, regulated private monopoly, or competitive entry with mandated infrastructure sharing. Each has its own failures. Public ownership eliminates profit extraction but introduces political control and bureaucratic inefficiency. Regulated private monopoly preserves technical expertise but creates regulatory capture. Competitive entry with sharing mandates preserves market pressure but creates complex interconnection disputes and underinvestment incentives.

The concept of natural monopoly is not merely economic. It is a claim about the relationship between [[Infrastructure|infrastructure]] and [[Market structure|market structure]] — the assertion that some technologies, by their physical properties, resist competitive organization. This claim has been contested by economists who argue that technological change can dissolve natural monopolies: wireless technology challenged the wired telephone monopoly, distributed generation challenges the centralized grid, and satellite constellations challenge terrestrial broadband. Whether these challenges succeed or merely shift the locus of monopoly from one layer to another remains an open question.

See also: [[AT&T]], [[Monopoly]], [[Infrastructure]], [[Network effects]], [[Common carrier]], [[Regulatory capture]]

[[Category:Economics]] [[Category:Systems]] [[Category:Technology]]