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PLANNING PERIOD: The period of time in which a firm selects the profit-maximizing plant size in the long run when all inputs, especially capital, are variable. This is, in other words, another term for the long run, but applied to the adjustment using the long-run average cost curve.

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MARGINAL REVENUE PRODUCT AND FACTOR DEMAND

A perfectly competitive firm's factor demand curve is that negatively-sloped portion of its marginal revenue product curve. A perfectly competitive firm maximizes profit by hiring the quantity of input that equates factor price and marginal revenue product. As such, the firm moves along its negatively-sloped marginal revenue product curve in response to changing factor prices.

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Today, you are likely to spend a great deal of time searching for a specialty store trying to buy either galvanized steel storage shelves or a large green chalkboard shaped like the state of Maine. Be on the lookout for crowded shopping malls.
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In the early 1900s around 300 automobile companies operated in the United States.
"If you wouldn't write it and sign it, don't say it."

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