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CHANGE IN AGGREGATE SUPPLY: A shift of the short-run or long-run aggregate supply curve caused by a change in one of the aggregate supply determinants. In essence, a change in aggregate supply is caused by any factor affecting supply EXCEPT the price level. This concept should be contrasted directly with a change in real production. You might also want to review the terms change in quantity supplied and change in supply, as well. The change in aggregate supply is comparable to the change in market supply. A change in aggregate supply is a change in ALL price level-real production combinations, meaning that each price level is matched up with a different level of real production (which is then illustrated as a shift of the short-run or long-run aggregate supply curve). This change in aggregate supply is caused by a change in any of the aggregate supply determinants. In contrast, a change in real production is a change from one price level-real production combination to the another.

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PERFECT COMPETITION, SHORT-RUN PRODUCTION ANALYSIS

A perfectly competitive firm produces the profit-maximizing quantity of output that equates marginal revenue and marginal cost. This production level can be identified using total revenue and cost, marginal revenue and cost, or profit. Because a perfectly competitive firm faces a perfectly elastic demand curve, it efficiently allocates resources by equating price and marginal cost. In addition, the marginal cost curve above the average variable cost curve is the perfectly competitive firm's short-run supply curve.

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