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DECREASING MARGINAL RETURNS: In the short-run production of a firm, an increase in the variable input results in a decrease in the marginal product of the variable input. Decreasing marginal returns typically surface after the first few quantities of a variable input are added to a fixed input. Compare this with increasing marginal returns. You should also compare this with diseconomies of scale associated with long-run production.

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PLANNING HORIZON

Another term for the long-run average cost curve. The long-run average cost curve is termed the planning horizon or planning curve because it provides information that a firm can use to plan factory construction and expansion in the long run.

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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either yellow cotton balls or a set of steel-belted radial snow tires. Be on the lookout for the last item on a shelf.
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The average length of a "business lunch" is about 36 minutes.
"Life is a promise; fulfill it. "

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Arbitrage Pricing Theory
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