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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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AGGREGATE DEMAND SHIFTS

Changes in the aggregate demand determinants cause the aggregate demand curve to shift. The mechanism is comparable to that for market demand determinants and market demand. There are two alternatives--an increase in aggregate demand and a decrease in aggregate demand. An increase in spending by any of the four sectors--household, business, government, and foreign--shifts the aggregate demand curve to right. A decrease in spending by these four sectors shifts the aggregate demand curve to left.

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Today, you are likely to spend a great deal of time at an auction trying to buy either shoe laces for your snow boots or a rim for your spare tire. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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The word "fiscal" is derived from a Latin word meaning "moneybag."
"To understand a man, you must know his memories. The same is true of a nation."

-- Anthony Quayle, Actor

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