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BARRIER TO ENTRY: An institutional, government, technological, or economic restriction 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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MARGINAL COST CURVE

A curve that graphically represents the relation between the marginal cost incurred by a firm in the short-run product of a good or service and the quantity of output produced. This curve is constructed to capture the relation between marginal cost and the level of output, holding other variables like technology and resource prices constant. Three related curves are average total cost curve, average variable cost curve, and average fixed cost curve.

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Today, you are likely to spend a great deal of time at an auction looking to buy either a rechargeable flashlight or storage boxes for your computer software CDs. Be on the lookout for the last item on a shelf.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"Failure is the opportunity to begin again, more intelligently. "

-- Henry Ford, automobile manufacturer

BCD
Business Cycle Development
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