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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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VARIABLE COST

In general, cost that changes with changes in the quantity of output produced. More specifically, variable cost is combined with the adjectives "total" and "average" to indicate the overall level of variable cost or the per unit variable cost. Variable cost depends on the amount produced. If there is no production, then there is no variable cost.

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Today, you are likely to spend a great deal of time at a crowded estate auction hoping to buy either a key chain with a built-in flashlight and panic button or a green and yellow striped sweater vest. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
"A stumble may prevent a fall. "

-- Margaret Thatcher, British prime minister

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