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PERFECT COMPETITION AND SHORT-RUN SUPPLY CURVE: A perfectly competitive firm's supply curve is that portion of its' marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along it's marginal cost curve in response to alternative prices. Because the marginal cost curve is positively sloped due to the law of diminishing marginal returns, the firm's supply curve is also positively sloped.

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ELASTICITY

The relative response of one variable to changes in another variable. Elasticity is commonly used in the study of market exchanges to identify the relative response of quantity (demanded and supplied) to changes in price. The phrase "relative response" is best interpreted as the percentage change, such as, the percentage change in quantity measured against the percentage change in price. The most common notions of elasticity are the price elasticity of demand and the price elasticity of supply. Other notable economic elasticities are the income elasticity of demand and the cross elasticity of demand.

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Today, you are likely to spend a great deal of time at a dollar discount store hoping to buy either a pair of gray heavy duty boot socks or a 50-foot blue garden hose. Be on the lookout for crowded shopping malls.
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In his older years, Andrew Carnegie seldom carried money because he was offended by its sight and touch.
"Divide each difficulty into as many parts as is feasible and necessary to resolve it."

-- Rene Descartes

AVC
Average Variable Cost
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