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MARGINAL REVENUE CURVE, MONOPOLISTIC COMPETITION: A curve that graphically represents the relation between marginal revenue received by a monopolistically competitive firm for selling its output and the quantity of output sold. The marginal revenue curve reflects the degree of market control held by a firm. For a monopolistically competitive firm with some market control, but not a whole lot, the marginal revenue curve is negatively-sloped but relatively elastic.

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BARRIERS TO ENTRY

Institutional, government, technological, or economic restrictions on the entry of participants into a market or industry. The four primary barriers to entry are: (1) resource ownership, (2) patents and copyrights, (3) government restrictions, and (2) start-up cost. Barriers to entry are a key reason for market control and the inefficiency that results. 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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Today, you are likely to spend a great deal of time wandering around the downtown area wanting to buy either a pair of handcrafted oven mitts or a coffee table shaped like the state of Florida. Be on the lookout for cardboard boxes.
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Francis Bacon (1561-1626), a champion of the scientific method, died when he caught a severe cold while attempting to preserve a chicken by filling it with snow.
"The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy."

-- Martin Luther King, Jr.

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