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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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AVERAGE COST

The opportunity cost incurred per unit of good produced. This is calculated by dividing the cost of production by the quantity of output produced. While average cost is a general term relating cost and the quantity of output, three specific average cost terms are average total cost, average variable cost, and average fixed cost. A related cost term is marginal cost.

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WHITE GULLIBON
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Today, you are likely to spend a great deal of time at a going out of business sale hoping to buy either a flower arrangement for that special day for your mother or a New York Yankees baseball cap. Be on the lookout for defective microphones.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"Opportunities are usually disguised as hard work, so most people don't recognize them."

-- Ann Landers, columnist

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