Define the following terms using economic terminology: monopoly; market power and market structure. Why do developed market economies seek to regulate utilities and industries that exhibit economies of scale?

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Define the following terms using economic terminology: monopoly; market power and market structure.  Why do developed market economies seek to regulate utilities and industries that exhibit economies of scale?  Using the case study material supplied plus textbook knowledge, show how the working of competition policy is guided by theories of monopoly and monopoly like market structures.

A monopoly is defined as follows:

In a monopolised industry, there is only one firm present or the firm holds 25% or more of the single market share.  The firm and the industry are therefore synonymous.  As a monopoly, there are little or no rivals for a firm.  The firm could be defined as a single seller as there are little or no close substitutes for the product a firm provides, meaning the firm holds the market power.  A good example of a monopoly would be The Post Office.  They are the only firm that provides the service or product that they do.  The monopolist does not need to consider the reactions of any rivals when setting the price of its outputs therefore making it a price-setter.  Typically, a monopoly will produce less, at a higher price.  It decides its price by calculating the quantity of output at which its marginal revenue would equal its marginal cost, and then sets whatever price would enable it to sell exactly the chosen quantity.  In practice, few monopolies are perfect, and their power to set prices or limit supply is often restricted by potential competition.  This often happens when a single firm dominates a market but has no pricing power because it is in a  arena, for example if it does not operate efficiently, a more efficient rival firm will take its entire market away.  

Market power is defined as follows:

Market power is the term used to define how much power a firm has over price, for example in a monopolized market the one buyer or seller has the ability to exercise significant influence over the quantity of goods and services produced or the price at which they are traded.  Market power only exists if there is a monopoly or oligopoly.  

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Market Structure is defined as follows:

The term market structure refers to the number of firms in an industry.  There are several types of market structures; there is perfect competition, imperfect competition, oligopolies, duopolies, and monopolies.  In perfect competition, there are a large number of small firms in the industry, each producing identical products, there are a large number of buyers, there is complete freedom of entry, and the firms often have perfect knowledge of market conditions.  In an imperfect competition, there are quite a large number of firms but each firm can provide different products, there ...

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