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Natural monopoly is a term used in economics to refer to two different things A natural monopoly and a monopoly are not the same concept. A natural monopoly describes a firm's cost structure (high fixed cost, extremely low constant marginal cost). A monopoly describes market share and market power; the two are not synonymous. This has been a source of some ambiguity in discussions of "natural monopoly".[2] All industries have costs associated with entering them. Often, a large portion of these costs is required for investment. Larger industries, like utilities, require enormous initial investment. This barrier to entry reduces the number of possible entrants into the industry regardless of the earning of the corporations within. Natural monopolies arise where the largest supplier in an industry, often the first supplier in a market, has an overwhelming cost advantage over other actual or potential competitors; this tends to be the case in industries where fixed costs predominate, creating economies of scale which are large in relation to the size of the market - examples include water services and electricity. It is very expensive to build transmission networks (water/gas pipelines, electricity and telephone lines), therefore it is unlikely that a potential competitor would be willing to make the capital investment needed to even enter the monopolists market.
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