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LONG-RUN INDUSTRY SUPPLY CURVE: The relation between market price and the quantity supplied by all firms in a perfectly competitive industry after the industry as completed its long-run adjustment. The long-run industry supply curve effectively traces out a series of equilibrium prices and quantities the reflect long-run adjustments of a perfectly competitive industry to demand shocks. This long-run adjustment can take one of three paths: increasing, decreasing, and constant. These three adjustment paths indicate an increasing-cost industry, decreasing-cost industry, and constant-cost industry, respectively.

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MARGINAL PRODUCTIVITY THEORY

A theory used to analyze the profit-maximizing quantity of inputs (that is, the services of factor of productions) purchased by a firm in the production of output. Marginal-productivity theory indicates that the demand for a factor of production is based on the marginal product of the factor. In particular, a firm is generally willing to pay a higher price for an input that is more productive and contributes more to output. The demand for an input is thus best termed a derived demand.

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Today, you are likely to spend a great deal of time looking for a downtown retail store looking to buy either a dozen high trajectory optic orange golf balls or a large red and white striped beach towel. Be on the lookout for the happiest person in the room.
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