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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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AVERAGE PRODUCT

The quantity of total output produced per unit of a variable input, holding all other inputs fixed. Average product, usually abbreviated AP, is found by dividing total product by the quantity of the variable input. Average product, which occasionally goes by the alias average physical product (APP), is one of two measures derived from total product. The other is marginal product.

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Today, you are likely to spend a great deal of time at a dollar discount store hoping to buy either a blue mechanical pencil or super soft, super cuddly, stuffed animals. Be on the lookout for crowded shopping malls.
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Junk bonds are so called because they have a better than 50% chance of default, carrying a Standard & Poor's rating of CC or lower.
"I can't change the direction of the wind, but I can adjust my sails to always reach my destination."

-- Jimmy Dean

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