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MARGINAL REVENUE, PERFECT COMPETITION: The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a perfectly competitive firm equates marginal revenue and marginal cost.

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PRICE ELASTICITY OF SUPPLY

The relative response of a change in quantity supplied to a change in price. More specifically the price elasticity of supply is the percentage change in quantity supplied due to a percentage change in price. This notion of elasticity captures the supply side of the market. A comparable elasticity on the demand side is the price elasticity of demand. Other notable supply 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 at a going out of business sale looking to buy either a bottle of blackcherry flavored spring water or a travel case for you toothbrush. Be on the lookout for attractive cable television service repair people.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"People of mediocre ability sometimes achieve outstanding success because they don't know when to quit. Most men succeed because they are determined to. "

-- George Allen, U.S. senator

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