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OLIGOPOLY AND MONOPOLY: Oligopoly and monopoly have some similarities, both tend to be relatively large and possess significant market control, but also have a few important differences, oligopoly market has more than one firm. The dividing line between oligopoly and monopoly, however, can be blurred due to the closeness of substitutes and the inclination of oligopoly firms to collude.

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CONSUMPTION RIVALRY

Whether or not the consumption of a particular good by one person prevents simultaneous consumption by another person. In other words, does consumption impose an opportunity cost on others. Rival consumption occurs if the consumption by one imposes an opportunity cost on others because others are prevented from consuming the good. Nonrival consumption occurs if the consumption by one does not impose an opportunity cost on others because others are not prevented from consuming the good. When combined with nonpayer excludability, the result is four alternative types of goods -- private, public, common-property, and near-public.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius wanting to buy either 500 feet of coaxial cable or a coffee cup commemorating the 1960 Presidential election. Be on the lookout for defective microphones.
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Three-forths of the gold mined each year is used to manufacture jewelry.
"Time is the scarcest resource, and unless it is managed nothing else can be managed."

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