Parallel Nature of Isocost Lines with Varying Costs
Isocost lines representing different total costs are parallel because their slope is determined exclusively by the relative prices of the inputs, which are assumed to be constant. For instance, with a wage (w) of £10 and a coal price (p) of £20, adding one worker increases costs by £10. To maintain the same total cost, the firm must reduce its coal input by 0.5 tons, which saves £10. This constant trade-off ratio ensures the slope remains at -0.5 (-(w/p)), regardless of the total budget, causing the lines to be parallel.
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Introduction to Microeconomics Course
The Economy 2.0 Microeconomics @ CORE Econ
Ch.2 Technology and incentives - The Economy 2.0 Microeconomics @ CORE Econ
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Consider a firm that uses two inputs: labor and capital. If the price of labor (the wage) doubles, and simultaneously the price of capital is halved, the resulting isocost line will become flatter.
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Learn After
Example of a £150 Isocost Line
Example of a £40 Isocost Line
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