The four market types are

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The four market types are generally recognized as perfect competition, monopoly, monopolistic competition, and oligopoly. These are the most common and widely studied market structures in economics. Option C lists all four of these market types. Option A includes "imperfect competition" as a separate market type, but this is generally considered to be a term that encompasses all market types other than perfect competition and monopoly. Option B includes "monopsony," which is a market structure in which there is only one buyer for a particular product or service, but it is not one of the four most commonly recognized market types. Option D includes "oligopolistic competition," which is not a separate market type but rather a type of market structure that can occur within both oligopoly and monopolistic competition. Option E includes "duopoly," which is a market structure in which there are only two sellers for a particular product or service, but it is not one of the four most commonly recognized market types.

The Four Market Types Are