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Difference between a monopoly and an oligopoly

Explain the difference between a monopoly and an oligopoly, the welfare effects of monopoly, cost advantages that create monopolies, government actions that create monopolies, and government actions that reduce market power.

SBC and ATT are planning to merge. Is tthis an monopoly or oligopoly and what actions, if any, do you think the government will take?

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In economics, a monopoly (from the Greek monos, one + polein, to sell) is defined as a persistent market situation where there is only one provider of a kind of product or service. Monopolies are characterized by a lack of economic competition for the good or service that they provide and a lack of viable substitute goods whereas an Oligopoly is market form in which a market is dominated by a small number of sellers (oligopolists). The word is derived from the Greek for few sellers. Because there are few participants in this type of market, each oligopolist is aware of the actions of the others. Oligopolistic markets are ...

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Difference between a monopoly and an oligopoly