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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 EXPENDITURES DETERMINANTS

Ceteris paribus factors, other than aggregate income or production, that are held constant when the aggregate expenditures line is constructed and which cause the aggregate expenditures line to shift when they change. Some of the more important aggregate expenditures determinants are interest rates, expectations, fiscal policy, wealth, and exchange rates.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors looking to buy either a coffee cup commemorating the first day of winter or a video game player. Be on the lookout for malfunctioning pocket calculators.
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In 1914, Ford paid workers who were age 22 or older $5 per day -- double the average wage offered by other car factories.
"Experience keeps a dear school, but fools will learn in no other. "

-- Benjamin Franklin

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Weakly Pareto Optimal
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