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ENTRY BARRIER: 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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TOTAL VARIABLE COST CURVE

A curve that graphically represents the relation between total variable cost incurred by a firm in the short-run production of a good or service and the quantity produced. When constructing this curve, it is assumed that total variable cost changes as a result of changes in the quantity of output produced, while other variables like technology and resource prices are held fixed. The total variable cost curve is one of three total cost curves, the other two are total cost curve and total fixed cost curve.

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APLS

GRAY SKITTERY
[What's This?]

Today, you are likely to spend a great deal of time flipping through mail order catalogs seeking to buy either a rim for your spare tire or decorative celebrity figurines. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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This isn't me! What am I?

A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"The only profit center is the customer."

-- Peter Drucker, educator

MSE
Mean Squared Error
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