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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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CONSUMPTION LINE

A graphical depiction of the relation between household sector consumption and income that forms one of the key building blocks for Keynesian economics. A consumption line is characterized by vertical intercept, which indicates autonomous consumption, and slope, which is the marginal propensity to consume and indicates induced consumption. The aggregate expenditures line used in Keynesian economics is derived by adding or stacking investment, government purchases, and net exports to the consumption line. Saving is indicated as the difference between the consumption line and the 45-degree guide line.

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Today, you are likely to spend a great deal of time at an auction wanting to buy either any book written by Stephan King or a T-shirt commemorating next Thursday. Be on the lookout for door-to-door salesmen.
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More money is spent on gardening than on any other hobby.
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