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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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MARGINAL PRODUCT

The change in the quantity of total product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal product, usually abbreviated MP, is found by dividing the change in total product by the change in the variable input. Marginal product, which occasionally goes by the alias marginal physical product (MPP), is one of two measures derived from total product. The other is average product.

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YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either a rechargeable battery for your computer or shoe laces for your snow boots. Be on the lookout for crowded shopping malls.
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The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
"Be kind and merciful. Let no one ever come to you without coming away better and happier."

-- Mother Teresa of Calcutta, humanitarian

ANOVA
Analysis of Variance
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