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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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PRICE ELASTICITY OF DEMAND

The relative response of a change in quantity demanded to a change in price. More specifically the price elasticity of demand is the percentage change in quantity demanded due to a percentage change in price. This notion of elasticity captures the demand side of the market. A comparable elasticity on the supply side is the price elasticity of supply. Other notable demand elasticities are income elasticity of demand and cross elasticity of demand.

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Today, you are likely to spend a great deal of time lost in your local discount super center seeking to buy either a replacement remote control for your television or a replacement nozzle for your shower. Be on the lookout for the last item on a shelf.
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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.
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