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July 18, 2025 

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PERFECT COMPETITION: An ideal market structure characterized by a large number of small firms, identical products sold by all firms, freedom of entry into and exit out of the industry, and perfect knowledge of prices and technology. This is one of four basic market structures. The other three are monopoly, oligopoly, and monopolistic competition. Perfect competition is an idealized market structure that's not observed in the real world. While unrealistic, it does provide an excellent benchmark that can be used to analyze real world market structures. In particular, perfect competition efficiently allocates resources.

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MARGINAL COST: The change in total cost (or total variable cost) resulting from a change in the quantity of output produced by a firm in the short run. Marginal cost indicates how much total cost changes for a give change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (remember total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. Marginal cost, usually abbreviated MC, is found by dividing the change in total cost (or total variable cost) by the change in output.

     See also | total cost | total variable cost | marginal cost curve | quantity | law of diminishing marginal returns | technology | resource prices | increasing marginal returns | decreasing marginal returns | U-shaped cost curves | average total cost | average variable cost | average fixed cost | total cost |


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MARGINAL COST, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 18, 2025].


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COMMUNISM

In theory, an economy, or economic system, based on--(1) a classless society, where everyone does their best to contribute to the common good, (2) common, rather than individual, ownership of all resources, (3) the complete disappearance of government, and (4) income allocated based entirely on need rather than on resource ownership or contribution to production. In practice, communism is a type of command economy based on--(1) government ownership and control of most resources, goods, and other assets and (2) excruciatingly detailed central planning by government.

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Today, you are likely to spend a great deal of time browsing about a thrift store seeking to buy either a genuine fake plastic Tiffany lamp or a microwave over that won't burn your popcorn. Be on the lookout for small children selling products door-to-door.
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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
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