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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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DURABLE GOODS, CONSUMPTION

Personal consumption expenditures on tangible goods that tend to last for more than a year. Common examples are cars, furniture, and appliances. This is one of three categories of personal consumption expenditures in the National Income and Product Accounts maintained by the Bureau of Economic Analysis. The other two are nondurable goods and services. Durable goods are about 12 percent of personal consumption expenditures and 8 percent of gross domestic product.

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Today, you are likely to spend a great deal of time searching the newspaper want ads hoping to buy either a tall storage cabinet with five shelves and a secure lock or a birthday greeting card for your grandmother. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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Two and a half gallons of oil are needed to produce one automobile tire.
"If I have ever made any valuable discoveries, it has been owing more to patient attention than to any other talent. "

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