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October 22, 2020 

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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

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COMMODITY MONEY: A medium of exchange (money) with both value in use and value in exchange. Commodity money is first and foremost a commodity that provides users with satisfaction of their wants and needs. However, it also has the secondary function of a medium of exchange.

     See also | money | fiat money | medium of exchange | value in use | value in exchange | satisfaction | barter | money characteristics | money functions |


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COMMODITY MONEY, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2020. [Accessed: October 22, 2020].


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MARGINAL PRODUCT

The change in the quantity of total product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal product, usually abbreviated MP, is found by dividing the change in total product by the change in the variable input. Marginal product, which occasionally goes by the alias marginal physical product (MPP), is one of two measures derived from total product. The other is average product.

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