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S-I MODEL: A model used to identify equilibrium in Keynesian economics based on injections (investment, I) and leakages (saving, S) for the two basic sectors (household and business). Equilibrium is achieved at the intersection of the saving line, S, and the investment line, I.

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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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Today, you are likely to spend a great deal of time at a flea market trying to buy either a how-to book on fine dining or a coffee cup commemorating the first day of winter. Be on the lookout for celebrities who speak directly to you through your television.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"I have no expectation of making a hit every time I come to bat. What I seek is the highest possible batting average."

-- President Franklin Delano Roosevelt

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