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MARKET CONTROL: The ability of buyers or sellers to exert influence over the price or quantity of a good, service, or commodity exchanged in a market. Market control depends on the number of competitors. If a market has relatively few buyers, but a bunch of sellers, then the buyers tend to have relatively more market control than sellers. The converse occurs if there are a bunch of buyers, but relatively few sellers. If the market is controlled on the supply side by one seller, we have a monopoly, and if it is controlled on the demand side by one buyer, we have a monopsony. Most markets are subject to some degree of control.

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MARGINAL PRODUCT CURVE: A curve that graphically illustrates the relation between marginal product and the quantity of the variable input, holding all other inputs fixed. This curve indicates the incremental change in output at each level of the variable input. The marginal product curve is one of three related curves used in the analysis of the short-run production of a firm. The other two are total product curve and average product curve. The marginal product curve plays in key role in the economic analysis of short-run production by a firm in large part because economists are generally obsessed with marginal changes in production.

     See also | marginal product | curve | total product | output | input | variable input | fixed input | average product | marginal cost | law of diminishing marginal returns | average-marginal rule | total-marginal rule | short-run production |


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MARGINAL PRODUCT CURVE, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: May 18, 2026].


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PROTECTIONISM

The view that the domestic sector of an economy, its consumers, and its producers should be protected from imports by imposing barriers to foreign trade. This is based on the notion that imports are detrimental to the economy and to its citizens. Protectionism is intended to secure domestic jobs, increase domestic wages, promote domestic production, and create a balance of trade surplus. It usually takes the form of tariffs, import quotas, and assorted non-tariff regulatory barriers.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius hoping to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for mail order catalogs with hidden messages.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
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