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PERFECT COMPETITION, LONG-RUN ADJUSTMENT: A perfectly competitive industry undertakes a two-part adjustment to equilibrium in the long run. One is the adjustment of each perfectly competitive firm to the appropriate factory size that maximizes long-run profit. The other is the entry of firms into the industry or exit of firms out of the industry, to eliminate economic profit or economic loss. The end result of this long-run adjustment is a multi-faceted equilibrium condition that price is equal to marginal cost and average cost (both short run and long run).

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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 browsing through a long list of dot com websites hoping to buy either a wall poster commemorating the 2000 Presidential election or a rechargeable flashlight. Be on the lookout for strangers with large satchels of used undergarments.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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