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February 7, 2026 

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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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PRINCIPLE OF MEDIAN LOCATION: A basic principle of location theory stating that an activity will select the median or middle point of location when selling an output to, or buying an input from, activities located a disperse points. In particular, this analysis indicates that the activity will locate at the median point, with an equal number of attraction points in any direction, rather than the arithmetic average of the distances to all points. The analysis imposes several restrictive assumptions, including a trip to each location, the same transit cost per mile to each location, the same quantity of output sold to, or input purchased from, each location. The principle of median voter is a similar principle that has been developed in the public choice study of voting behavior.

     See also | location theory | competition along a line | spatial | space | accessibility | dispersive force | attractive force | public choice |


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AVERAGE PRODUCT AND MARGINAL PRODUCT

A mathematical connection between average product and marginal product stating that the change in the average product depends on a comparison between the average product and marginal product. If marginal product is less than average product, then average product declines. If marginal product is greater than average product, then average product rises. If marginal product is equal to average product, then average product does not change.

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Today, you are likely to spend a great deal of time lost in your local discount super center seeking to buy either a how-to book on fixing your computer, with illustrations or several magazines on computer software. Be on the lookout for rusty deck screws.
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Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"Everyone's got it in him, if he'll only make up his mind and stick at it. None of us is born with a stop-valve on his powers or with a set limit to his capacities. There's no limit possible to the expansion of each one of us."

-- Charles M. Schwab

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