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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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DERIVED DEMAND

The notion that the demand for a factor of production, or an input used in the production of a good, depends on the demand for the output being produced. This concept highlights the two key aspects of factor demand. One is that factor demand depends on the value of the good being produced. Inputs that produce more valuable outputs are themselves more highly valued. Two is that factor demand depends on the productivity of the input. Inputs that produce more output are themselves more highly valued.

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GRAY SKITTERY
[What's This?]

Today, you are likely to spend a great deal of time flipping through the yellow pages looking to buy either a how-to book on surfing the Internet or a computer that can play music and burn CDs. Be on the lookout for slightly overweight pizza delivery guys.
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This isn't me! What am I?

Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."

-- Mark Twain

ITO
International Trade Organization
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