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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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SLOPE, SHORT-RUN AGGREGATE SUPPLY CURVE

The positive slope of the short-run aggregate supply curve, reflecting the direct relation between the price level and real production, results for three primary reasons--inflexible resources, frictional and structural unemployment, and purchasing power imbalances.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time at the confiscated property police auction wanting to buy either a rechargeable battery for your cell phone or a T-shirt commemorating the 2000 Olympics. Be on the lookout for broken fingernail clippers.
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This isn't me! What am I?

The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"If you are neutral in situations of injustice, you have chosen the side of the oppressor. If an elephant has its foot on the tail of a mouse and you say that you are neutral, the mouse will not appreciate your neutrality."

-- Desmond Tutu, activist

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Chicago Mercantile Exchange
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