Concept

Calculation and Meaning of Isocost Line Slope (w=£10, p=£20)

The slope of an isocost line, defined as the change in the vertical axis input (energy) divided by the change in the horizontal axis input (labor), is determined by the negative ratio of input prices, (w/p)-(w/p). For a wage (w) of £10 and a coal price (p) of £20, the slope is calculated as (10/20)=0.5-(10/20) = -0.5. This value represents the economic trade-off: to keep total costs constant, if a firm hires one more worker (costing an extra £10), it must reduce its coal usage by 0.5 tons (saving £10).

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Updated 2026-05-02

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