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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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VARIABLE COST

In general, cost that changes with changes in the quantity of output produced. More specifically, variable cost is combined with the adjectives "total" and "average" to indicate the overall level of variable cost or the per unit variable cost. Variable cost depends on the amount produced. If there is no production, then there is no variable cost.

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BEIGE MUNDORTLE
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Today, you are likely to spend a great deal of time at a dollar discount store looking to buy either a weathervane with a cow on top or a box of multi-colored, plastic paper clips. Be on the lookout for cardboard boxes.
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The average length of a "business lunch" is about 36 minutes.
"I not only use all the brains that I have, but all that I can borrow. "

-- Woodrow Wilson, 28th US president

WACM
Weak Axiom of Cost Minimization
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